tree: 87a59f6c0fd54b72bd897458fbaac4d83de63cc0 [path history] [tgz]
  1. .travis.yml
  2. LICENSE.txt
  4. go.mod
  5. go.sum
  6. xxhash.go
  7. xxhash_amd64.go
  8. xxhash_amd64.s
  9. xxhash_other.go
  10. xxhash_safe.go
  11. xxhash_unsafe.go


GoDoc Build Status

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