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Infinite loop when using dash::copy #653

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bertwesarg opened this issue Jul 3, 2019 · 1 comment · May be fixed by #655
Closed

Infinite loop when using dash::copy #653

bertwesarg opened this issue Jul 3, 2019 · 1 comment · May be fixed by #655
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bug module:algorithms

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@bertwesarg
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bertwesarg commented Jul 3, 2019 •
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I have a code which wants to copy a NArray to a NArray which has a smaller team and uses dash::copy for each line:

#include <iostream>

#include <libdash.h>

int
main(int ac, char *av[])
{
    using TeamSpecT = dash::TeamSpec<2>;
    using MatrixT = dash::NArray<double, 2>;
    using PatternT = typename MatrixT::pattern_type;
    using SizeSpecT = dash::SizeSpec<2>;
    using DistSpecT = dash::DistributionSpec<2>;

    dash::init(&ac, &av);

    auto size_spec = SizeSpecT(16, 16);
    auto dist_spec = DistSpecT(dash::BLOCKED, dash::BLOCKED);

    auto& team_all = dash::Team::All();
    TeamSpecT team_all_spec(team_all.size(), 1);
    team_all_spec.balance_extents();
    MatrixT grid_more(size_spec, dist_spec, team_all, team_all_spec);
    dash::fill(grid_more.begin(), grid_more.end(), 0.0);
    team_all.barrier();

    dash::Team& team_fewer= team_all.split(4);
    TeamSpecT team_fewer_spec(team_fewer.size(), 1);
    team_fewer_spec.balance_extents();

    if (0 == team_fewer.position()) {
        MatrixT grid_fewer(size_spec, dist_spec, team_fewer, team_fewer_spec);
        dash::fill(grid_fewer.begin(), grid_fewer.end(), 1.0);

        auto lextents= grid_fewer.pattern().local_extents();

        for (uint32_t y = 0; y < lextents[0]; ++y) {
            auto gcorner_fewer = grid_fewer.pattern().global({y, 0});
            auto gbegin = grid_more.begin() + grid_more.pattern().global_at(gcorner_fewer);

            auto loffset = grid_fewer.pattern().local_at({y, 0});
            dash::copy(gbegin, gbegin + lextents[1],
                      grid_fewer.lbegin() + loffset);
        }
        team_fewer.barrier();

        if (team_fewer.myid() == 0) {
            auto gextents = grid_fewer.extents();
            for (    uint32_t y = 0; y < gextents[0]; ++y) {
                std::cout << "[" << y << "] := {";
                for (uint32_t x = 0; x < gextents[1]; ++x)
                    std::cout << " " << (double)grid_fewer[y][x];
                std::cout << "}\n";
            }
        }

        team_fewer.barrier();
    }
    team_all.barrier();

    dash::finalize();

    return 0;
}

Running this with 4 units results in an infinite loop on unit 0 (the one which pulls the matrix into its local memroy):

[   -1 DEBUG ] [ 18554 ] Init.cc                  :34   | dash::init                                   | dash::util::Config::init() 
[   -1 DEBUG ] [ 18554 ] Init.cc                  :48   | dash::init                                   | dart_init() 
[   -1 DEBUG ] [ 18555 ] Init.cc                  :34   | dash::init                                   | dash::util::Config::init() 
[   -1 DEBUG ] [ 18555 ] Init.cc                  :48   | dash::init                                   | dart_init() 
[   -1 DEBUG ] [ 18560 ] Init.cc                  :34   | dash::init                                   | dash::util::Config::init() 
[   -1 DEBUG ] [ 18560 ] Init.cc                  :48   | dash::init                                   | dart_init() 
[   -1 DEBUG ] [ 18561 ] Init.cc                  :34   | dash::init                                   | dash::util::Config::init() 
[   -1 DEBUG ] [ 18561 ] Init.cc                  :48   | dash::init                                   | dart_init() 
[    0 DEBUG ] [ 18554 ] Init.cc                  :69   | dash::init                                   | dash::util::Locality::init() 
[    2 DEBUG ] [ 18560 ] Init.cc                  :69   | dash::init                                   | dash::util::Locality::init() 
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 2
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :1485 | BlockPattern.init_lcapacity >                | |- l_capacity: 64
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :1496 | BlockPattern.init_local_range()              | |- l_size: 64
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 8 0 }
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 7 7 }
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 15 7 }
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :1506 | BlockPattern.init_local_range >              | |- _lbegin: 128
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :1507 | BlockPattern.init_local_range >              | |- _lend: 248
[    2 DEBUG ] [ 18560 ] GlobStaticMem.h          :287  | MemorySpace.MemorySpace                      | |- team: dash::Team(0)
[    2 DEBUG ] [ 18560 ] AllocationPolicy.h       :170  | GlobalAllocationPolicy.do_global_allocate(nlocal)| number of local values: 512 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 0
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1485 | BlockPattern.init_lcapacity >                | |- l_capacity: 64
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1496 | BlockPattern.init_local_range()              | |- l_size: 64
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 0 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 7 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 7 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1506 | BlockPattern.init_local_range >              | |- _lbegin: 0
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1507 | BlockPattern.init_local_range >              | |- _lend: 120
[    0 DEBUG ] [ 18554 ] GlobStaticMem.h          :287  | MemorySpace.MemorySpace                      | |- team: dash::Team(0)
[    0 DEBUG ] [ 18554 ] AllocationPolicy.h       :170  | GlobalAllocationPolicy.do_global_allocate(nlocal)| number of local values: 512 
[    3 DEBUG ] [ 18561 ] Init.cc                  :69   | dash::init                                   | dash::util::Locality::init() 
[    1 DEBUG ] [ 18555 ] Init.cc                  :69   | dash::init                                   | dash::util::Locality::init() 
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 3
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :1485 | BlockPattern.init_lcapacity >                | |- l_capacity: 64
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :1496 | BlockPattern.init_local_range()              | |- l_size: 64
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 8 8 }
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 7 7 }
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 15 15 }
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :1506 | BlockPattern.init_local_range >              | |- _lbegin: 136
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :1507 | BlockPattern.init_local_range >              | |- _lend: 256
[    3 DEBUG ] [ 18561 ] GlobStaticMem.h          :287  | MemorySpace.MemorySpace                      | |- team: dash::Team(0)
[    3 DEBUG ] [ 18561 ] AllocationPolicy.h       :170  | GlobalAllocationPolicy.do_global_allocate(nlocal)| number of local values: 512 
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :1485 | BlockPattern.init_lcapacity >                | |- l_capacity: 64
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :1496 | BlockPattern.init_local_range()              | |- l_size: 64
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 0 8 }
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 7 7 }
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 7 15 }
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :1506 | BlockPattern.init_local_range >              | |- _lbegin: 8
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :1507 | BlockPattern.init_local_range >              | |- _lend: 128
[    1 DEBUG ] [ 18555 ] GlobStaticMem.h          :287  | MemorySpace.MemorySpace                      | |- team: dash::Team(0)
[    1 DEBUG ] [ 18555 ] AllocationPolicy.h       :170  | GlobalAllocationPolicy.do_global_allocate(nlocal)| number of local values: 512 
[    3 DEBUG ] [ 18561 ] Team.h                   :291  | Team.register_deallocator()                  | |- object: 0x7fff2af4e840
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    3 DEBUG ] [ 18561 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 8 8 }
[    1 DEBUG ] [ 18555 ] Team.h                   :291  | Team.register_deallocator()                  | |- object: 0x7fff61569620
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    1 DEBUG ] [ 18555 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 0 8 }
[    0 DEBUG ] [ 18554 ] Team.h                   :291  | Team.register_deallocator()                  | |- object: 0x7fff0e6ff570
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 0 0 }
[    2 DEBUG ] [ 18560 ] Team.h                   :291  | Team.register_deallocator()                  | |- object: 0x7ffd1a2f5ef0
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    2 DEBUG ] [ 18560 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 8 0 }
[    2 DEBUG ] [ 18560 ] Team.cc                  :81   | Team.split()                                 | |- num_parts: 4
[    1 DEBUG ] [ 18555 ] Team.cc                  :81   | Team.split()                                 | |- num_parts: 4
[    3 DEBUG ] [ 18561 ] Team.cc                  :81   | Team.split()                                 | |- num_parts: 4
[    0 DEBUG ] [ 18554 ] Team.cc                  :81   | Team.split()                                 | |- num_parts: 4
[    0 DEBUG ] [ 18554 ] Team.h                   :569  | Team.register_team                           | team id: 1 
[    1 DEBUG ] [ 18555 ] Team.h                   :569  | Team.register_team                           | team id: 2 
[    2 DEBUG ] [ 18560 ] Team.h                   :569  | Team.register_team                           | team id: 3 
[    3 DEBUG ] [ 18561 ] Team.h                   :569  | Team.register_team                           | team id: 4 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 0
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 16 16 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1485 | BlockPattern.init_lcapacity >                | |- l_capacity: 256
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1496 | BlockPattern.init_local_range()              | |- l_size: 256
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 15 15 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1506 | BlockPattern.init_local_range >              | |- _lbegin: 0
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1507 | BlockPattern.init_local_range >              | |- _lend: 256
[    0 DEBUG ] [ 18554 ] GlobStaticMem.h          :287  | MemorySpace.MemorySpace                      | |- team: dash::Team(1.0)
[    0 DEBUG ] [ 18554 ] AllocationPolicy.h       :170  | GlobalAllocationPolicy.do_global_allocate(nlocal)| number of local values: 2048 
[    0 DEBUG ] [ 18554 ] Team.h                   :291  | Team.register_deallocator()                  | |- object: 0x7fff0e6ff920
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 0 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 0 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 0 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 1 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 1 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 1 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 1 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 1 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 2 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 2 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 2 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 2 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 2 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 3 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 3 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 3 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 3 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 3 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 4 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 4 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 4 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 4 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 4 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 5 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 5 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 5 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 5 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 5 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 6 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 6 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 6 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 6 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 6 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 7 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 2
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 7 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 7 0 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 7 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :738  | BlockPattern.global >                        | |- glob_index: long { 7 7 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 1
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :714  | BlockPattern.global()                        | |- local_coords: long { 8 0 }
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :597  | LocalityDomain.init()                        | domain: .0 
[    0 DEBUG ] [ 18554 ] LocalityDomain.cc        :647  | LocalityDomain.init >                        | domain: .0 
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1516 | BlockPattern.init_local_extents()            | |- unit: 2
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1517 | BlockPattern.init_local_extents()            | |- _nunits: 4
[    0 DEBUG ] [ 18554 ] BlockPattern.h           :1578 | BlockPattern.init_local_extents >            | |- l_extents: unsigned long { 8 8 }

The last two lines are reapeated indefinitly.
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Fix local_size() in some patterns and improve short-cut detection dash-project/dash
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@fuchsto @bertwesarg @devreal