mirror of https://github.com/prometheus/prometheus
35 lines
1.5 KiB
Markdown
35 lines
1.5 KiB
Markdown
# xxhash
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[](https://godoc.org/github.com/cespare/xxhash)
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xxhash is a Go implementation of the 64-bit
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[xxHash](http://cyan4973.github.io/xxHash/) algorithm, XXH64. This is a
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high-quality hashing algorithm that is much faster than anything in the Go
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standard library.
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The API is very small, taking its cue from the other hashing packages in the
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standard library:
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$ go doc github.com/cespare/xxhash !
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package xxhash // import "github.com/cespare/xxhash"
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Package xxhash implements the 64-bit variant of xxHash (XXH64) as described
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at http://cyan4973.github.io/xxHash/.
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func New() hash.Hash64
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func Sum64(b []byte) uint64
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This implementation provides a fast pure-Go implementation and an even faster
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assembly implementation for amd64.
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Here are some quick benchmarks comparing the pure-Go and assembly
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implementations of Sum64 against another popular Go XXH64 implementation,
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[github.com/OneOfOne/xxhash](https://github.com/OneOfOne/xxhash):
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| input size | OneOfOne | cespare (noasm) | cespare |
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| --- | --- | --- | --- |
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| 5 B | 438.34 MB/s | 596.40 MB/s | 711.11 MB/s |
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| 100 B | 3676.54 MB/s | 4301.40 MB/s | 4598.95 MB/s |
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| 4 KB | 8128.64 MB/s | 8840.83 MB/s | 10549.72 MB/s |
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| 10 MB | 7335.19 MB/s | 7736.64 MB/s | 9024.04 MB/s |
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