mirror of
https://github.com/cwinfo/matterbridge.git
synced 2025-07-04 13:37:44 +00:00
49
vendor/github.com/klauspost/compress/zstd/internal/xxhash/README.md
generated
vendored
49
vendor/github.com/klauspost/compress/zstd/internal/xxhash/README.md
generated
vendored
@ -2,12 +2,7 @@
|
||||
|
||||
VENDORED: Go to [github.com/cespare/xxhash](https://github.com/cespare/xxhash) for original package.
|
||||
|
||||
|
||||
[](https://godoc.org/github.com/cespare/xxhash)
|
||||
[](https://travis-ci.org/cespare/xxhash)
|
||||
|
||||
xxhash is a Go implementation of the 64-bit
|
||||
[xxHash](http://cyan4973.github.io/xxHash/) algorithm, XXH64. This is a
|
||||
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.
|
||||
|
||||
@ -28,31 +23,49 @@ 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.
|
||||
The package is written with optimized pure Go and also contains even faster
|
||||
assembly implementations for amd64 and arm64. If desired, the `purego` build tag
|
||||
opts into using the Go code even on those architectures.
|
||||
|
||||
[xxHash]: http://cyan4973.github.io/xxHash/
|
||||
|
||||
## 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 |
|
||||
| input size | purego | asm |
|
||||
| ---------- | --------- | --------- |
|
||||
| 4 B | 1.3 GB/s | 1.2 GB/s |
|
||||
| 16 B | 2.9 GB/s | 3.5 GB/s |
|
||||
| 100 B | 6.9 GB/s | 8.1 GB/s |
|
||||
| 4 KB | 11.7 GB/s | 16.7 GB/s |
|
||||
| 10 MB | 12.0 GB/s | 17.3 GB/s |
|
||||
|
||||
These numbers were generated on Ubuntu 18.04 with an Intel i7-8700K CPU using
|
||||
the following commands under Go 1.11.2:
|
||||
These numbers were generated on Ubuntu 20.04 with an Intel Xeon Platinum 8252C
|
||||
CPU using the following commands under Go 1.19.2:
|
||||
|
||||
```
|
||||
$ go test -tags purego -benchtime 10s -bench '/xxhash,direct,bytes'
|
||||
$ go test -benchtime 10s -bench '/xxhash,direct,bytes'
|
||||
benchstat <(go test -tags purego -benchtime 500ms -count 15 -bench 'Sum64$')
|
||||
benchstat <(go test -benchtime 500ms -count 15 -bench 'Sum64$')
|
||||
```
|
||||
|
||||
## Projects using this package
|
||||
|
||||
- [InfluxDB](https://github.com/influxdata/influxdb)
|
||||
- [Prometheus](https://github.com/prometheus/prometheus)
|
||||
- [VictoriaMetrics](https://github.com/VictoriaMetrics/VictoriaMetrics)
|
||||
- [FreeCache](https://github.com/coocood/freecache)
|
||||
- [FastCache](https://github.com/VictoriaMetrics/fastcache)
|
||||
|
Reference in New Issue
Block a user