TwoX-Hash

A Rust implementation of the XXHash algorithm.

Documentation

Examples

With a fixed seed

use std::hash::BuildHasherDefault;
use std::collections::HashMap;
use twox_hash::XxHash64;

let mut hash: HashMap<_, _, BuildHasherDefault<XxHash64>> = Default::default();
hash.insert(42, "the answer");
assert_eq!(hash.get(&42), Some(&"the answer"));

With a random seed

use std::collections::HashMap;
use twox_hash::RandomXxHashBuilder64;

let mut hash: HashMap<_, _, RandomXxHashBuilder64> = Default::default();
hash.insert(42, "the answer");
assert_eq!(hash.get(&42), Some(&"the answer"));

Benchmarks

64-bit

Bytes	SipHasher (MB/s)	XXHash (MB/s)	Ratio
1	52	38	73%
4	210	148	70%
16	615	615	100%
32	914	1391	152%
128	1347	3657	271%
256	1414	5019	355%
512	1546	6168	399%
1024	1565	6206	397%
1048576	1592	7564	475%

Bytes	FnvHasher (MB/s)	XXHash (MB/s)	Ratio
1	1000	38	4%
4	800	148	19%
16	761	615	81%
32	761	1391	183%
128	727	3657	503%
256	759	5019	661%
512	745	6168	828%
1024	741	6206	838%
1048576	745	7564	1015%

32-bit

Bytes	SipHasher (MB/s)	XXHash32 (MB/s)	Ratio
1	52	55	106%
4	210	210	100%
16	615	1230	200%
32	914	1882	206%
128	1347	3282	244%
256	1414	3459	245%
512	1546	3792	245%
1024	1565	3938	252%
1048576	1592	4127	259%

Bytes	FnvHasher (MB/s)	XXHash32 (MB/s)	Ratio
1	1000	55	6%
4	800	210	26%
16	761	1230	162%
32	761	1882	247%
128	727	3282	451%
256	759	3459	456%
512	745	3792	509%
1024	741	3938	531%
1048576	745	4127	554%

Contributing

1. Fork it ( https://github.com/shepmaster/twox-hash/fork )
2. Create your feature branch (git checkout -b my-new-feature)
3. Add a failing test.
4. Add code to pass the test.
5. Commit your changes (git commit -am 'Add some feature')
6. Ensure tests pass.
7. Push to the branch (git push origin my-new-feature)
8. Create a new Pull Request