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  1. e307e39 Added Power Support ppc64le by nagesh4193 · 13 days ago master
  2. d7df741 Fix go vet complaint by Caleb Spare · 11 months ago v2.1.1
  3. 2372543 Merge remote-tracking branch 'jooola/patch-1' by Caleb Spare · 12 months ago
  4. 34bb48f Be more specific about supported Go versions by Caleb Spare · 12 months ago
  5. b06934c Fix minimal go version (>1.11) by Jonas L · 12 months ago


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xxhash is a Go implementation of the 64-bit xxHash algorithm, XXH64. This is a high-quality hashing algorithm that is much faster than anything in the Go standard library.

This package provides a straightforward API:

func Sum64(b []byte) uint64
func Sum64String(s string) uint64
type Digest struct{ ... }
    func New() *Digest

The Digest type implements hash.Hash64. Its key methods are:

func (*Digest) Write([]byte) (int, error)
func (*Digest) WriteString(string) (int, error)
func (*Digest) Sum64() uint64

This implementation provides a fast pure-Go implementation and an even faster assembly implementation for amd64.


This package is in a module and the latest code is in version 2 of the module. You need a version of Go with at least “minimal module compatibility” to use

  • 1.9.7+ for Go 1.9
  • 1.10.3+ for Go 1.10
  • Go 1.11 or later

I recommend using the latest release of Go.


Here are some quick benchmarks comparing the pure-Go and assembly implementations of Sum64.

input sizepuregoasm
5 B979.66 MB/s1291.17 MB/s
100 B7475.26 MB/s7973.40 MB/s
4 KB17573.46 MB/s17602.65 MB/s
10 MB17131.46 MB/s17142.16 MB/s

These numbers were generated on Ubuntu 18.04 with an Intel i7-8700K CPU using the following commands under Go 1.11.2:

$ go test -tags purego -benchtime 10s -bench '/xxhash,direct,bytes'
$ go test -benchtime 10s -bench '/xxhash,direct,bytes'

Projects using this package