kilo/vendor/github.com/cespare/xxhash/v2
leonnicolas 70d2751030
bumg golang 1.15 -> 1.17
Signed-off-by: leonnicolas <leonloechner@gmx.de>
2021-09-30 17:47:47 +02:00
..
.travis.yml go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
LICENSE.txt go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
README.md go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
xxhash_amd64.go go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
xxhash_amd64.s go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
xxhash_other.go go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
xxhash_safe.go go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
xxhash_unsafe.go go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00
xxhash.go go.mod: bump client-go and api machinerie 2021-05-15 12:12:50 +02:00

xxhash

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.

Compatibility

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 github.com/cespare/xxhash/v2:

  • 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.

Benchmarks

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

input size purego asm
5 B 979.66 MB/s 1291.17 MB/s
100 B 7475.26 MB/s 7973.40 MB/s
4 KB 17573.46 MB/s 17602.65 MB/s
10 MB 17131.46 MB/s 17142.16 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