1e34f29532
* Vendor dependencies. This updates several old dependencies, removes some that are no longer needed, and adds `pkg/labels` from prometheus `dev-2.0` branch. * Add metrics selector parsing code This is a temporary simplified re-implementation of promQL's metric selector parsing. * Add alerts filtering Filter alerts through `?filter=` query string. * Add silences filtering Filter silences through `?filter=` query string. * Move `parse` to `pkg/parse` |
||
|---|---|---|
| .. | ||
| LICENSE.txt | ||
| README.md | ||
| xxhash.go | ||
| xxhash_amd64.go | ||
| xxhash_amd64.s | ||
| xxhash_other.go | ||
README.md
xxhash
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.
The API is very small, taking its cue from the other hashing packages in the standard library:
$ go doc github.com/cespare/xxhash !
package xxhash // import "github.com/cespare/xxhash"
Package xxhash implements the 64-bit variant of xxHash (XXH64) as described
at http://cyan4973.github.io/xxHash/.
func New() hash.Hash64
func Sum64(b []byte) uint64
func Sum64String(s string) uint64
This implementation provides a fast pure-Go implementation and an even faster assembly implementation for amd64.
Benchmarks
Here are some quick benchmarks comparing the pure-Go and assembly implementations of Sum64 against another popular Go XXH64 implementation, github.com/OneOfOne/xxhash:
| input size | OneOfOne | cespare (noasm) | cespare |
|---|---|---|---|
| 5 B | 438.34 MB/s | 596.40 MB/s | 711.11 MB/s |
| 100 B | 3676.54 MB/s | 4301.40 MB/s | 4598.95 MB/s |
| 4 KB | 8128.64 MB/s | 8840.83 MB/s | 10549.72 MB/s |
| 10 MB | 7335.19 MB/s | 7736.64 MB/s | 9024.04 MB/s |