Name: xxHash
Owner: Ceph
Description: Extremely fast non-cryptographic hash algorithm
Forked from: Cyan4973/xxHash
Created: 2016-03-08 21:07:58.0
Updated: 2016-12-08 01:57:16.0
Pushed: 2016-03-12 16:42:05.0
Homepage: http://www.xxhash.com/
Size: 413
Language: C
GitHub Committers
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Other Committers
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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.
|Branch |Status |
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|master | 
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|dev | 
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Branch Policy:
- 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.
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
| Name | Speed | Quality | Author | |—————|———-|:——-:|——————| | xxHash | 5.4 GB/s | 10 | Y.C. | | 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 | | CRC32 | 0.43 GB/s| 9 | | | MD5-32 | 0.33 GB/s| 10 | Ronald L.Rivest | | SHA1-32 | 0.28 GB/s| 10 | |
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.
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 |
The library files xxhash.c and 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.