leveldb_bench.txt

> mkdir("/tmp/leveldbtest-1002", 493) = -1 in 2830ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [1] leveldb::(anonymous namespace)::PosixEnv::GetTestDirectory(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:700
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d15fe79070 in 9526ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d15fe79070) = {d_ino=2234885, d_off=1780414432903348703, d_reclen=32, d_type=8, d_name="000003.log"} in 16680ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 33ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 28ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 25ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 20ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 20ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 24ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = nullptr = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d15fe79070) = 0 in 2468ns
 = backtraces:
 = [2] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d15fe79070 in 2970ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d15fe79070) = {d_ino=2234885, d_off=1780414432903348703, d_reclen=32, d_type=8, d_name="000003.log"} in 6413ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 37ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 21ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 24ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 21ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 20ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 26ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d15fe79070) = nullptr = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d15fe79070) = 0 in 1852ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 5 in 7575ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(5, 6, 0x7ffc2a07a3e0) = 0 in 4394ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> unlink("/tmp/leveldbtest-1002/dbbench/000003.log") = 0 in 22482ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOG") = 0 in 21055ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/CURRENT") = 0 in 14633ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002") = 0 in 10108ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(5, 6, 0x7ffc2a07a3e0) = 0 in 1099ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(5) = 0 in 1391ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOCK") = 0 in 5784ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> rmdir("/tmp/leveldbtest-1002/dbbench") = 0 in 23006ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:632
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:462
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< rmdir(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = 0 in 27115ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOG", 525377, 420) = 5 in 8855ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewLogger(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Logger**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:717
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = -1 in 921ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 6 in 7217ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(6, 6, 0x7ffc2a07a1f0) = 0 in 1740ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> access("/tmp/leveldbtest-1002/dbbench/CURRENT", 0) = -1 in 3625ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::FileExists(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:599
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< access(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524865, 420) = 7 in 6477ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d1601dcc48, 41) = 41 in 3636ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 8 in 3298ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(8) = 0 in 22230659ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(8) = 0 in 2578ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(7) = 0 in 24600812ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 3046ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/000001.dbtmp", 524865, 420) = 7 in 17748ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d16031fd38, 16) = 16 in 6255ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(7) = 0 in 22226793ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 2234ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/CURRENT", 524288) = 7 in 2613ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d1606a9570, 8192) = 16 in 4515ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> read(7, 0x55d1606a9570, 8192) = 0 in 501ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 1538ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524288) = 7 in 3851ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d1606ab5e0, 32768) = 41 in 1500ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [7] leveldb::log::Reader::ReadPhysicalRecord(leveldb::Slice*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:189
 = [6] leveldb::log::Reader::ReadRecord(leveldb::Slice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:56
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 1180ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16071a640 in 6196ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16071a640) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 4680ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a640) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 48ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a640) = {d_ino=2234884, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 28ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a640) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 24ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a640) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 22ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a640) = {d_ino=1313974, d_off=9223372036854775807, d_reclen=24, d_type=4, d_name=".."} in 22ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a640) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16071a640) = 0 in 1396ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/000003.log", 524865, 420) = 7 in 13263ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002", 524865, 420) = 8 in 6216ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(8, 0x55d16072a6a8, 35) = 35 in 5651ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::VersionSet::WriteSnapshot(leveldb::log::Writer*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:1069
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> write(8, 0x55d16072a6a8, 15) = 15 in 1214ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [6] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [5] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 9 in 1440ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(9) = 0 in 14472875ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 1850ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(8) = 0 in 102384658ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> open("/tmp/leveldbtest-1002/dbbench/000002.dbtmp", 524865, 420) = 9 in 19700ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(9, 0x55d16073a708, 16) = 16 in 5764ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(9) = 0 in 117321190ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 2381ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16073a700 in 6650ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16073a700) = {d_ino=2234885, d_off=1501108754394894498, d_reclen=32, d_type=8, d_name="000003.log"} in 4446ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 51ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 48ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 28ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 26ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 29ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 28ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 28ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a700) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16073a700) = 0 in 1485ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001") = 0 in 13615ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(6, 6, 0x7ffc2a07a470) = 0 in 1920ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(6) = 0 in 1041ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(8) = 0 in 467ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::VersionSet::~VersionSet() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:753
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(7) = 0 in 545ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16071a610 in 3506ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16071a610) = {d_ino=2234885, d_off=1780414432903348703, d_reclen=32, d_type=8, d_name="000003.log"} in 2886ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 60ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 37ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 23ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 29ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 21ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 29ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = nullptr = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16071a610) = 0 in 849ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 5 in 2241ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 1186ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> unlink("/tmp/leveldbtest-1002/dbbench/000003.log") = 0 in 6541ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOG") = 0 in 7860ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/CURRENT") = 0 in 8635ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002") = 0 in 7507ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 630ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(5) = 0 in 687ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOCK") = 0 in 4725ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> rmdir("/tmp/leveldbtest-1002/dbbench") = 0 in 14105ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:632
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< rmdir(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = 0 in 12848ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOG", 525377, 420) = 5 in 5494ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewLogger(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Logger**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:717
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = -1 in 761ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 6 in 5556ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(6, 6, 0x7ffc2a07a1f0) = 0 in 1056ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> access("/tmp/leveldbtest-1002/dbbench/CURRENT", 0) = -1 in 3296ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::FileExists(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:599
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< access(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524865, 420) = 7 in 5910ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d16071a618, 41) = 41 in 3482ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 8 in 1472ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(8) = 0 in 134133598ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(8) = 0 in 2694ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(7) = 0 in 141809880ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 2428ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/000001.dbtmp", 524865, 420) = 7 in 14986ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d16071a618, 16) = 16 in 6856ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(7) = 0 in 142521216ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 2968ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/CURRENT", 524288) = 7 in 2787ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d1606acae0, 8192) = 16 in 1986ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> read(7, 0x55d1606acae0, 8192) = 0 in 348ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 801ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524288) = 7 in 1629ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d16071a610, 32768) = 41 in 1393ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [7] leveldb::log::Reader::ReadPhysicalRecord(leveldb::Slice*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:189
 = [6] leveldb::log::Reader::ReadRecord(leveldb::Slice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:56
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 517ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16071a610 in 2447ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16071a610) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 3839ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 44ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234884, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 29ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 23ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 26ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=1313974, d_off=9223372036854775807, d_reclen=24, d_type=4, d_name=".."} in 23ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16071a610) = 0 in 1072ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/000003.log", 524865, 420) = 7 in 9332ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002", 524865, 420) = 8 in 5370ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(8, 0x55d16072a678, 35) = 35 in 5258ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::VersionSet::WriteSnapshot(leveldb::log::Writer*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:1069
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> write(8, 0x55d16072a678, 15) = 15 in 1230ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [6] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [5] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 9 in 1367ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(9) = 0 in 76546401ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 2874ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(8) = 0 in 129465544ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> open("/tmp/leveldbtest-1002/dbbench/000002.dbtmp", 524865, 420) = 9 in 22460ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(9, 0x55d16073a6d8, 16) = 16 in 10363ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(9) = 0 in 141262428ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 3205ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16073a6d0 in 3427ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234885, d_off=1501108754394894498, d_reclen=32, d_type=8, d_name="000003.log"} in 6782ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 50ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 30ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 20ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 22ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 21ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 23ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 20ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16073a6d0) = 0 in 1524ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001") = 0 in 12641ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> write(7, 0x55d16071a618, 138) = 138 in 13899ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 2278ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1221ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1173ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 999ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1191ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 903ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1027ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1261ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 997ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 908ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1192ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 951ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1039ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1178ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 928ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 925ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1193ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 933ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1040ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1202ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 914ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1158ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1080ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 912ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1234ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 913ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1434ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1237ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 4026ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1110ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1201ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 932ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 915ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1201ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 920ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1056ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1202ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 915ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 913ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1181ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 929ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1061ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1221ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 947ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 929ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1165ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 945ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1055ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1187ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 935ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1315ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1051ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 941ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1296ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 930ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 917ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1151ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 955ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 2780ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1272ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 945ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 937ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1189ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 988ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 932ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1260ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 977ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 955ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1200ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 964ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 933ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1249ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1764ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 954ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1227ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 948ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1042ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1198ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 910ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1234ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 907ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 944ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1230ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 935ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 940ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1178ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 960ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 935ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 2922ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 937ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 916ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1185ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 937ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 928ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1260ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 928ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 932ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1205ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1167ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteSeq(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:789
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> fcntl(6, 6, 0x7ffc2a07a470) = 0 in 2300ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(6) = 0 in 2567ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(8) = 0 in 1191ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::VersionSet::~VersionSet() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:753
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(7) = 0 in 747ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16071a610 in 5639ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16071a610) = {d_ino=2234885, d_off=1780414432903348703, d_reclen=32, d_type=8, d_name="000003.log"} in 6107ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 54ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 46ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 32ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 32ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 32ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 31ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = nullptr = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16071a610) = 0 in 962ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 5 in 3019ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 1156ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> unlink("/tmp/leveldbtest-1002/dbbench/000003.log") = 0 in 17509ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOG") = 0 in 6246ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/CURRENT") = 0 in 11052ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002") = 0 in 8316ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 804ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(5) = 0 in 794ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOCK") = 0 in 4705ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> rmdir("/tmp/leveldbtest-1002/dbbench") = 0 in 13700ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:632
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< rmdir(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = 0 in 11963ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOG", 525377, 420) = 5 in 5734ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewLogger(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Logger**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:717
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = -1 in 735ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 6 in 4979ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(6, 6, 0x7ffc2a07a1f0) = 0 in 1022ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> access("/tmp/leveldbtest-1002/dbbench/CURRENT", 0) = -1 in 3113ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::FileExists(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:599
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< access(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524865, 420) = 7 in 5767ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d16071a618, 41) = 41 in 3132ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 8 in 1500ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(8) = 0 in 355512420ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(8) = 0 in 3086ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(7) = 0 in 24687366ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 3020ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/000001.dbtmp", 524865, 420) = 7 in 17770ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d16071a618, 16) = 16 in 8242ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(7) = 0 in 24525229ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 3999ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/CURRENT", 524288) = 7 in 3388ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d1606acae0, 8192) = 16 in 2268ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> read(7, 0x55d1606acae0, 8192) = 0 in 335ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 1002ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524288) = 7 in 1802ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d16071a610, 32768) = 41 in 1375ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [7] leveldb::log::Reader::ReadPhysicalRecord(leveldb::Slice*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:189
 = [6] leveldb::log::Reader::ReadRecord(leveldb::Slice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:56
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 615ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16071a610 in 2697ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16071a610) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 4186ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 55ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234884, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 56ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=1313974, d_off=9223372036854775807, d_reclen=24, d_type=4, d_name=".."} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16071a610) = 0 in 1188ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/000003.log", 524865, 420) = 7 in 11090ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002", 524865, 420) = 8 in 5742ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(8, 0x55d16072a678, 35) = 35 in 5814ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::VersionSet::WriteSnapshot(leveldb::log::Writer*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:1069
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> write(8, 0x55d16072a678, 15) = 15 in 1103ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [6] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [5] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 9 in 1483ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(9) = 0 in 14642345ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 3410ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(8) = 0 in 24845235ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> open("/tmp/leveldbtest-1002/dbbench/000002.dbtmp", 524865, 420) = 9 in 22332ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(9, 0x55d16073a6d8, 16) = 16 in 11230ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(9) = 0 in 24711475ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 4053ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16073a6d0 in 4321ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234885, d_off=1501108754394894498, d_reclen=32, d_type=8, d_name="000003.log"} in 4472ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 48ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 31ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16073a6d0) = 0 in 1782ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001") = 0 in 14118ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(6, 6, 0x7ffc2a07a470) = 0 in 2262ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(6) = 0 in 3796ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(8) = 0 in 732ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::VersionSet::~VersionSet() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:753
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(7) = 0 in 1211ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16071a610 in 7108ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16071a610) = {d_ino=2234885, d_off=1780414432903348703, d_reclen=32, d_type=8, d_name="000003.log"} in 5823ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 52ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 40ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 33ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 32ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 33ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 31ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = nullptr = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16071a610) = 0 in 992ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 5 in 3319ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 1263ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> unlink("/tmp/leveldbtest-1002/dbbench/000003.log") = 0 in 10529ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOG") = 0 in 9601ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/CURRENT") = 0 in 10470ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002") = 0 in 8280ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 745ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(5) = 0 in 701ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOCK") = 0 in 4818ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> rmdir("/tmp/leveldbtest-1002/dbbench") = 0 in 12616ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:632
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< rmdir(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = 0 in 12379ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOG", 525377, 420) = 5 in 5990ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewLogger(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Logger**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:717
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = -1 in 849ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 6 in 5458ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(6, 6, 0x7ffc2a07a1f0) = 0 in 1015ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> access("/tmp/leveldbtest-1002/dbbench/CURRENT", 0) = -1 in 3075ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::FileExists(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:599
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< access(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524865, 420) = 7 in 5560ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d16071a618, 41) = 41 in 4130ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 8 in 1562ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(8) = 0 in 14388264ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(8) = 0 in 2430ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(7) = 0 in 24920100ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 3602ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/000001.dbtmp", 524865, 420) = 7 in 22444ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d16071a618, 16) = 16 in 7294ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(7) = 0 in 32814839ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 3487ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/CURRENT", 524288) = 7 in 3306ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d1606acae0, 8192) = 16 in 2071ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> read(7, 0x55d1606acae0, 8192) = 0 in 367ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 958ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524288) = 7 in 2321ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d16071a610, 32768) = 41 in 1244ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [7] leveldb::log::Reader::ReadPhysicalRecord(leveldb::Slice*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:189
 = [6] leveldb::log::Reader::ReadRecord(leveldb::Slice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:56
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 565ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16071a610 in 2617ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16071a610) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 3938ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 60ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234884, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 35ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 34ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = {d_ino=1313974, d_off=9223372036854775807, d_reclen=24, d_type=4, d_name=".."} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16071a610) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16071a610) = 0 in 1212ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/000003.log", 524865, 420) = 7 in 10130ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002", 524865, 420) = 8 in 5131ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(8, 0x55d16072a678, 35) = 35 in 4890ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::VersionSet::WriteSnapshot(leveldb::log::Writer*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:1069
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> write(8, 0x55d16072a678, 15) = 15 in 1094ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [6] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [5] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 9 in 1414ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(9) = 0 in 14818411ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 2908ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(8) = 0 in 32947271ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> open("/tmp/leveldbtest-1002/dbbench/000002.dbtmp", 524865, 420) = 9 in 16117ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(9, 0x55d16073a6d8, 16) = 16 in 7211ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(9) = 0 in 33016531ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 2641ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d16073a6d0 in 4141ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234885, d_off=1501108754394894498, d_reclen=32, d_type=8, d_name="000003.log"} in 4023ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 65ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 31ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d16073a6d0) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d16073a6d0) = 0 in 1526ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001") = 0 in 13660ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> write(7, 0x55d16071a618, 138) = 138 in 13642ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1776ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1165ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1170ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1291ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 948ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1226ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 950ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 977ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1244ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1067ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 960ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1213ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 936ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 930ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1229ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1052ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1331ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1079ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 941ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1569ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1102ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 938ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1192ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 954ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 953ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1193ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1076ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 923ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 3982ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 973ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 992ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1193ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1063ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 935ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1158ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 929ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 936ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1176ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1043ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 946ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1217ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 944ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1148ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1018ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1063ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1163ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 937ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 938ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1148ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 918ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1036ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1170ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 932ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 965ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1140ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 910ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1039ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1123ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 3472ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 943ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1165ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 943ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1073ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1174ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 2130ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1011ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1163ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1048ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1298ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1063ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 952ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1176ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 966ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1056ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1185ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 945ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 942ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1142ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 927ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1057ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1111ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 959ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 936ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1178ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 935ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1070ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1162ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 975ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 3509ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1168ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 916ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1073ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1157ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 920ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1353ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1037ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 930ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1199ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1012ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 8337ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1429ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1191ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1259ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1131ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1033ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1034ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1136ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1095ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1029ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1112ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1047ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1034ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1105ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 2028ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1028ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1088ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1017ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 3596ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1170ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 980ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1020ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1072ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1000ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1105ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1057ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1001ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1047ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 992ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 988ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1111ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1067ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1013ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1046ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1001ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1007ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1093ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1069ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 997ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1076ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 986ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1004ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1103ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1065ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1004ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1031ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1013ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1042ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 3997ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1113ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 984ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 999ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1012ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1025ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1023ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1065ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1595ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1327ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 955ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1124ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1056ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 967ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1026ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 985ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 982ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1077ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1060ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 982ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1049ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 978ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 961ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1093ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1037ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 976ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1033ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 969ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 957ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1038ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 3550ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1046ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1007ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 975ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1035ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1014ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1045ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1073ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 981ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 983ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1027ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1033ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1064ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1002ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1000ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 982ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1065ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1015ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1066ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1023ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 981ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> write(7, 0x55d16071a618, 138) = 138 in 1183ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [5] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [4] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [3] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [2] leveldb::Benchmark::DoWrite(leveldb::(anonymous namespace)::ThreadState*, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:793
 = [1] leveldb::Benchmark::WriteRandom(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:791
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< write(...)
> open("/tmp/leveldbtest-1002/dbbench/000004.log", 524865, 420) = 9 in 20934ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [5] leveldb::DBImpl::MakeRoomForWrite(bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1325
 = [4] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [3] leveldb::DBImpl::TEST_CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:638
 = [2] leveldb::DBImpl::CompactRange(leveldb::Slice const*, leveldb::Slice const*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:582
 = [1] leveldb::Benchmark::Compact(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:986
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< open(...)
> close(7) = 0 in 2278ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [5] leveldb::DBImpl::MakeRoomForWrite(bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1325
 = [4] leveldb::DBImpl::Write(leveldb::WriteOptions const&, leveldb::WriteBatch*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1200
 = [3] leveldb::DBImpl::TEST_CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:638
 = [2] leveldb::DBImpl::CompactRange(leveldb::Slice const*, leveldb::Slice const*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:582
 = [1] leveldb::Benchmark::Compact(leveldb::(anonymous namespace)::ThreadState*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:986
 = [0] leveldb::Benchmark::ThreadBody(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:619
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/000005.ldb", 524865, 420) = 7 in 16958ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< open(...)
> write(7, 0x7f8ea0065ed8, 4180) = 4180 in 14765ns
 = backtraces:
 = [12] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [9] leveldb::TableBuilder::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:125
 = [8] leveldb::TableBuilder::Add(leveldb::Slice const&, leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:94
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> write(7, 0x7f8ea0065ed8, 4178) = 4178 in 8067ns
 = backtraces:
 = [12] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [9] leveldb::TableBuilder::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:125
 = [8] leveldb::TableBuilder::Add(leveldb::Slice const&, leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:94
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> write(7, 0x7f8ea0065ed8, 4171) = 4171 in 3791ns
 = backtraces:
 = [12] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [9] leveldb::TableBuilder::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:125
 = [8] leveldb::TableBuilder::Add(leveldb::Slice const&, leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:94
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> write(7, 0x7f8ea0065ed8, 4172) = 4172 in 3393ns
 = backtraces:
 = [12] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [9] leveldb::TableBuilder::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:125
 = [8] leveldb::TableBuilder::Add(leveldb::Slice const&, leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:94
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> write(7, 0x7f8ea0065ed8, 4174) = 4174 in 3382ns
 = backtraces:
 = [12] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [9] leveldb::TableBuilder::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:125
 = [8] leveldb::TableBuilder::Add(leveldb::Slice const&, leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:94
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> write(7, 0x7f8ea0065ed8, 1694) = 1694 in 1162ns
 = backtraces:
 = [12] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [9] leveldb::TableBuilder::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:125
 = [8] leveldb::TableBuilder::Finish() in /home/szhong/IOTrace/build/_deps/leveldb-src/table/table_builder.cc:198
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> write(7, 0x7f8ea0065ed8, 266) = 266 in 1233ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> fdatasync(7) = 0 in 33547188ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< fdatasync(...)
> close(7) = 0 in 18477ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/000005.ldb", 524288) = 7 in 4519ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixEnv::NewRandomAccessFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::RandomAccessFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:540
 = [9] leveldb::TableCache::FindTable(unsigned long, unsigned long, leveldb::Cache::Handle**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:42
 = [8] leveldb::TableCache::NewIterator(leveldb::ReadOptions const&, unsigned long, unsigned long, leveldb::Table**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:80
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< open(...)
> __xstat(1, "/tmp/leveldbtest-1002/dbbench/000005.ldb", {dev=64768, ino=2234884, mode=33188, nlink=1, uid=1002, gid=1001, rdev=0, size=22835, blksize=4096, blocks=48, atim=1643707554.124260671, mtim=1643707554.128260643, ctim=1643707554.128260643}) = 0 in 2292ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixEnv::GetFileSize(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:639
 = [10] leveldb::(anonymous namespace)::PosixEnv::NewRandomAccessFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::RandomAccessFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:540
 = [9] leveldb::TableCache::FindTable(unsigned long, unsigned long, leveldb::Cache::Handle**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:42
 = [8] leveldb::TableCache::NewIterator(leveldb::ReadOptions const&, unsigned long, unsigned long, leveldb::Table**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:80
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< __xstat(...)
> mmap(nullptr) = 0x7f8eaed18000 in 5334ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixEnv::NewRandomAccessFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::RandomAccessFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:540
 = [9] leveldb::TableCache::FindTable(unsigned long, unsigned long, leveldb::Cache::Handle**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:42
 = [8] leveldb::TableCache::NewIterator(leveldb::ReadOptions const&, unsigned long, unsigned long, leveldb::Table**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:80
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< mmap(...)
> close(7) = 0 in 291ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixEnv::NewRandomAccessFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::RandomAccessFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:540
 = [9] leveldb::TableCache::FindTable(unsigned long, unsigned long, leveldb::Cache::Handle**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:42
 = [8] leveldb::TableCache::NewIterator(leveldb::ReadOptions const&, unsigned long, unsigned long, leveldb::Table**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:80
 = [7] leveldb::BuildTable(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Env*, leveldb::Options const&, leveldb::TableCache*, leveldb::Iterator*, leveldb::FileMetaData*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/builder.cc:18
 = [6] leveldb::DBImpl::WriteLevel0Table(leveldb::MemTable*, leveldb::VersionEdit*, leveldb::Version*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:506
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< close(...)
> write(8, 0x55d16072a678, 72) = 72 in 2443ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [8] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [7] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [6] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 7 in 3466ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [6] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< open(...)
> fdatasync(7) = 0 in 14643947ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [6] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< fdatasync(...)
> close(7) = 0 in 2509ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [6] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< close(...)
> fdatasync(8) = 0 in 12187092ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [6] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< fdatasync(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x7f8ea017ce30 in 7718ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< opendir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234885, d_off=1780414432903348703, d_reclen=32, d_type=8, d_name="000003.log"} in 6216ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234881, d_off=1985017592227609157, d_reclen=24, d_type=8, d_name="LOG"} in 33ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234883, d_off=2253878239654665894, d_reclen=32, d_type=8, d_name="000004.log"} in 32ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 32ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234882, d_off=3991209793952277649, d_reclen=24, d_type=8, d_name="LOCK"} in 31ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234884, d_off=4951630453071896342, d_reclen=32, d_type=8, d_name="000005.ldb"} in 31ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 31ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 31ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 31ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> readdir(0x7f8ea017ce30) = nullptr = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< readdir(...)
> closedir(0x7f8ea017ce30) = 0 in 1500ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< closedir(...)
> unlink("/tmp/leveldbtest-1002/dbbench/000003.log") = 0 in 19916ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [6] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [5] leveldb::DBImpl::CompactMemTable() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:549
 = [4] leveldb::DBImpl::BackgroundCompaction() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:702
 = [3] leveldb::DBImpl::BackgroundCall() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:683
 = [2] leveldb::DBImpl::BGWork(void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:679
 = [1] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadMain() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:835
 = [0] leveldb::(anonymous namespace)::PosixEnv::BackgroundThreadEntryPoint(leveldb::(anonymous namespace)::PosixEnv*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:750
< unlink(...)
> fcntl(6, 6, 0x7ffc2a07a470) = 0 in 2285ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(6) = 0 in 2011ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(8) = 0 in 627ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::VersionSet::~VersionSet() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:753
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(9) = 0 in 1791ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> munmap(0x7f8eaed18000, 22835) = 0 in 5429ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixMmapReadableFile::~PosixMmapReadableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:254
 = [10] leveldb::(anonymous namespace)::PosixMmapReadableFile::~PosixMmapReadableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:254
 = [9] leveldb::DeleteEntry(leveldb::Slice const&, void*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:19
 = [8] leveldb::(anonymous namespace)::LRUCache::Unref(leveldb::(anonymous namespace)::LRUHandle*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/cache.cc:226
 = [7] leveldb::(anonymous namespace)::LRUCache::~LRUCache() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/cache.cc:206
 = [6] leveldb::(anonymous namespace)::ShardedLRUCache::~ShardedLRUCache() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/cache.cc:358
 = [5] leveldb::(anonymous namespace)::ShardedLRUCache::~ShardedLRUCache() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/cache.cc:358
 = [4] leveldb::TableCache::~TableCache() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/table_cache.cc:39
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< munmap(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d1607bb6b0 in 5230ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d1607bb6b0) = {d_ino=2234881, d_off=1985017592227609157, d_reclen=24, d_type=8, d_name="LOG"} in 6752ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = {d_ino=2234883, d_off=2253878239654665894, d_reclen=32, d_type=8, d_name="000004.log"} in 41ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 33ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = {d_ino=2234882, d_off=3991209793952277649, d_reclen=24, d_type=8, d_name="LOCK"} in 33ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = {d_ino=2234884, d_off=4951630453071896342, d_reclen=32, d_type=8, d_name="000005.ldb"} in 33ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 33ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 34ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 34ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bb6b0) = nullptr = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d1607bb6b0) = 0 in 1170ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 5 in 2816ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 1527ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOG") = 0 in 11975ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/000004.log") = 0 in 5175ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/CURRENT") = 0 in 11647ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/000005.ldb") = 0 in 11783ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002") = 0 in 7478ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(5, 6, 0x7ffc2a07a3a0) = 0 in 786ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(5) = 0 in 788ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> unlink("/tmp/leveldbtest-1002/dbbench/LOCK") = 0 in 4474ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> rmdir("/tmp/leveldbtest-1002/dbbench") = 0 in 13534ns
 = backtraces:
 = [3] leveldb::(anonymous namespace)::PosixEnv::RemoveDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:632
 = [2] leveldb::DestroyDB(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1528
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< rmdir(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = 0 in 12494ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOG", 525377, 420) = 5 in 5934ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewLogger(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::Logger**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:717
 = [5] leveldb::SanitizeOptions(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::InternalKeyComparator const*, leveldb::InternalFilterPolicy const*, leveldb::Options const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:97
 = [4] leveldb::DBImpl::DBImpl(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:126
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> mkdir("/tmp/leveldbtest-1002/dbbench", 493) = -1 in 762ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::CreateDir(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:625
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< mkdir(...)
> open("/tmp/leveldbtest-1002/dbbench/LOCK", 524354, 420) = 6 in 5476ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fcntl(6, 6, 0x7ffc2a07a1f0) = 0 in 931ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [5] leveldb::(anonymous namespace)::PosixEnv::LockFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::FileLock**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:656
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> access("/tmp/leveldbtest-1002/dbbench/CURRENT", 0) = -1 in 3083ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::FileExists(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:599
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< access(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524865, 420) = 7 in 5172ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d1607bc6c8, 41) = 41 in 3180ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 8 in 1440ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(8) = 0 in 22113792ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(8) = 0 in 1739ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(7) = 0 in 32953726ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 2974ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/000001.dbtmp", 524865, 420) = 7 in 17143ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(7, 0x55d1607bc6c8, 16) = 16 in 5163ns
 = backtraces:
 = [11] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(7) = 0 in 24425188ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(7) = 0 in 2221ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [8] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [7] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [6] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [5] leveldb::DBImpl::NewDB() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:181
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/CURRENT", 524288) = 7 in 2686ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d1607bc6c0, 8192) = 16 in 1831ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> read(7, 0x55d1607bc6c0, 8192) = 0 in 397ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 736ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::ReadFileToString(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:81
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001", 524288) = 7 in 1596ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixEnv::NewSequentialFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::SequentialFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:528
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> read(7, 0x55d1607bc6c0, 32768) = 41 in 1308ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixSequentialFile::Read(unsigned long, leveldb::Slice*, char*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:142
 = [7] leveldb::log::Reader::ReadPhysicalRecord(leveldb::Slice*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:189
 = [6] leveldb::log::Reader::ReadRecord(leveldb::Slice*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_reader.cc:56
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< read(...)
> close(7) = 0 in 645ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [6] leveldb::(anonymous namespace)::PosixSequentialFile::~PosixSequentialFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:140
 = [5] leveldb::VersionSet::Recover(bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:861
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d1607bc6c0 in 2825ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d1607bc6c0) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 8505ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bc6c0) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 58ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bc6c0) = {d_ino=2234884, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 34ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bc6c0) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 34ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bc6c0) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bc6c0) = {d_ino=1313974, d_off=9223372036854775807, d_reclen=24, d_type=4, d_name=".."} in 35ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607bc6c0) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d1607bc6c0) = 0 in 1115ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::Recover(leveldb::VersionEdit*, bool*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:292
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> open("/tmp/leveldbtest-1002/dbbench/000003.log", 524865, 420) = 7 in 9813ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> open("/tmp/leveldbtest-1002/dbbench/MANIFEST-000002", 524865, 420) = 8 in 5506ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(8, 0x55d1607cd738, 35) = 35 in 4330ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [7] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [6] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [5] leveldb::VersionSet::WriteSnapshot(leveldb::log::Writer*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:1069
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> write(8, 0x55d1607cd738, 15) = 15 in 1264ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Flush() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:332
 = [6] leveldb::log::Writer::EmitPhysicalRecord(leveldb::log::RecordType, char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:83
 = [5] leveldb::log::Writer::AddRecord(leveldb::Slice const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/log_writer.cc:34
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> open("/tmp/leveldbtest-1002/dbbench", 524288) = 9 in 12453ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> fdatasync(9) = 0 in 14624053ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 2364ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncDirIfManifest() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:375
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> fdatasync(8) = 0 in 24658949ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> open("/tmp/leveldbtest-1002/dbbench/000002.dbtmp", 524865, 420) = 9 in 17984ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixEnv::NewWritableFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::WritableFile**) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:573
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< open(...)
> write(9, 0x55d1607dd798, 16) = 16 in 10668ns
 = backtraces:
 = [10] leveldb::(anonymous namespace)::PosixWritableFile::WriteUnbuffered(char const*, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:360
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::FlushBuffer() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:354
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< write(...)
> fdatasync(9) = 0 in 24639079ns
 = backtraces:
 = [9] leveldb::(anonymous namespace)::PosixWritableFile::SyncFd(int, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:397
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Sync() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:334
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fdatasync(...)
> close(9) = 0 in 2279ns
 = backtraces:
 = [8] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [7] leveldb::DoWriteStringToFile(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:51
 = [6] leveldb::WriteStringToFileSync(leveldb::Env*, leveldb::Slice const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env.cc:77
 = [5] leveldb::SetCurrentFile(leveldb::Env*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, unsigned long) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/filename.cc:124
 = [4] leveldb::VersionSet::LogAndApply(leveldb::VersionEdit*, leveldb::port::Mutex*) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:777
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> opendir("/tmp/leveldbtest-1002/dbbench") = 0x55d1607dd790 in 6099ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< opendir(...)
> readdir(0x55d1607dd790) = {d_ino=2234885, d_off=1501108754394894498, d_reclen=32, d_type=8, d_name="000003.log"} in 4193ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = {d_ino=2234883, d_off=1780414432903348703, d_reclen=40, d_type=8, d_name="MANIFEST-000001"} in 56ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = {d_ino=2234881, d_off=2253878239654665894, d_reclen=24, d_type=8, d_name="LOG"} in 40ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = {d_ino=2234887, d_off=3636117957198713864, d_reclen=32, d_type=8, d_name="CURRENT"} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = {d_ino=2234882, d_off=4951630453071896342, d_reclen=24, d_type=8, d_name="LOCK"} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = {d_ino=2234880, d_off=7043539781645960818, d_reclen=24, d_type=4, d_name="."} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = {d_ino=1313974, d_off=9061853741421941179, d_reclen=24, d_type=4, d_name=".."} in 33ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = {d_ino=2234886, d_off=9223372036854775807, d_reclen=40, d_type=8, d_name="MANIFEST-000002"} in 32ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> readdir(0x55d1607dd790) = nullptr = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< readdir(...)
> closedir(0x55d1607dd790) = 0 in 1377ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::GetChildren(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::vector<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::allocator<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > >*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:603
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< closedir(...)
> unlink("/tmp/leveldbtest-1002/dbbench/MANIFEST-000001") = 0 in 12740ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::PosixEnv::RemoveFile(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:618
 = [4] leveldb::DBImpl::RemoveObsoleteFiles() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:225
 = [3] leveldb::DB::Open(leveldb::Options const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, leveldb::DB**) in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:1483
 = [2] leveldb::Benchmark::Open() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:759
 = [1] leveldb::Benchmark::Run() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:493
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< unlink(...)
> fcntl(6, 6, 0x7ffc2a07a610) = 0 in 2471ns
 = backtraces:
 = [5] leveldb::(anonymous namespace)::LockOrUnlock(int, bool) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:467
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::~Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:487
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< fcntl(...)
> close(6) = 0 in 2779ns
 = backtraces:
 = [4] leveldb::(anonymous namespace)::PosixEnv::UnlockFile(leveldb::FileLock*) in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:680
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::~Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:487
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(8) = 0 in 1049ns
 = backtraces:
 = [7] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::VersionSet::~VersionSet() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/version_set.cc:753
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::~Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:487
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)
> close(7) = 0 in 1042ns
 = backtraces:
 = [6] leveldb::(anonymous namespace)::PosixWritableFile::Close() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:322
 = [5] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [4] leveldb::(anonymous namespace)::PosixWritableFile::~PosixWritableFile() in /home/szhong/IOTrace/build/_deps/leveldb-src/util/env_posix.cc:286
 = [3] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [2] leveldb::DBImpl::~DBImpl() in /home/szhong/IOTrace/build/_deps/leveldb-src/db/db_impl.cc:152
 = [1] leveldb::Benchmark::~Benchmark() in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:487
 = [0] main(...) in /home/szhong/IOTrace/build/_deps/leveldb-src/benchmarks/db_bench.cc:1021
< close(...)