|author||Yann Collet <email@example.com>||Wed Aug 10 05:38:31 2016|
|committer||GitHub <firstname.lastname@example.org>||Wed Aug 10 05:38:31 2016|
Merge pull request #80 from Cyan4973/dev v0.6.2
xxHash is an Extremely fast Hash algorithm, running at RAM speed limits. It successfully completes the SMHasher test suite which evaluates collision, dispersion and randomness qualities of hash functions.
The benchmark uses SMHasher speed test, compiled with Visual 2010 on a Windows Seven 32-bits box. The reference system uses a Core 2 Duo @3GHz
|MurmurHash 3a||2.7 GB/s||10||Austin Appleby|
|SBox||1.4 GB/s||9||Bret Mulvey|
|Lookup3||1.2 GB/s||9||Bob Jenkins|
|CityHash64||1.05 GB/s||10||Pike & Alakuijala|
|FNV||0.55 GB/s||5||Fowler, Noll, Vo|
|MD5-32||0.33 GB/s||10||Ronald L.Rivest|
Q.Score is a measure of quality of the hash function. It depends on successfully passing SMHasher test set. 10 is a perfect score. Algorithms with a score < 5 are not listed on this table.
A new version, XXH64, has been created thanks to [Mathias Westerdahl]'s contribution, which offers superior speed and dispersion for 64-bits systems. Note however that 32-bits applications will still run faster using the 32-bits version. [Mathias Westerdahl]: https://github.com/JCash
SMHasher speed test, compiled using GCC 4.8.2, on Linux Mint 64-bits. The reference system uses a Core i5-3340M @2.7GHz
|Version||Speed on 64-bits||Speed on 32-bits|
|XXH64||13.8 GB/s||1.9 GB/s|
|XXH32||6.8 GB/s||6.0 GB/s|
This project also includes a command line utility, named
xxhsum, offering similar features as
md5sum, thanks to Takayuki Matsuoka contributions.
The library files
xxhash.h are BSD licensed. The utility
xxhsum is GPL licensed.
Beyond the C reference version, xxHash is also available on many programming languages, thanks to great contributors. They are listed here.
- The “master” branch is considered stable, at all times.
- The “dev” branch is the one where all contributions must be merged before being promoted to master.
- If you plan to propose a patch, please commit into the “dev” branch, or its own feature branch. Direct commit to “master” are not permitted.