mirror of
https://github.com/prometheus/prometheus.git
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125 lines
2.6 KiB
Go
125 lines
2.6 KiB
Go
// Copyright 2017 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package test
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import (
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"crypto/rand"
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"fmt"
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"hash/crc32"
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"testing"
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"github.com/cespare/xxhash"
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sip13 "github.com/dgryski/go-sip13"
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)
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type pair struct {
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name, value string
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}
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var testInput = []pair{
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{"job", "node"},
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{"instance", "123.123.1.211:9090"},
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{"path", "/api/v1/namespaces/<namespace>/deployments/<name>"},
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{"method", "GET"},
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{"namespace", "system"},
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{"status", "500"},
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}
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func BenchmarkHash(b *testing.B) {
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input := []byte{}
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for _, v := range testInput {
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input = append(input, v.name...)
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input = append(input, '\xff')
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input = append(input, v.value...)
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input = append(input, '\xff')
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}
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var total uint64
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var k0 uint64 = 0x0706050403020100
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var k1 uint64 = 0x0f0e0d0c0b0a0908
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for name, f := range map[string]func(b []byte) uint64{
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"xxhash": xxhash.Sum64,
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"fnv64": fnv64a,
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"sip13": func(b []byte) uint64 { return sip13.Sum64(k0, k1, b) },
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} {
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b.Run(name, func(b *testing.B) {
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b.SetBytes(int64(len(input)))
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total = 0
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for i := 0; i < b.N; i++ {
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total += f(input)
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}
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})
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}
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}
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// hashAdd adds a string to a fnv64a hash value, returning the updated hash.
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func fnv64a(b []byte) uint64 {
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const (
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offset64 = 14695981039346656037
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prime64 = 1099511628211
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)
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h := uint64(offset64)
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for x := range b {
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h ^= uint64(x)
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h *= prime64
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}
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return h
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}
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func BenchmarkCRC32_diff(b *testing.B) {
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data := [][]byte{}
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for i := 0; i < 1000; i++ {
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b := make([]byte, 512)
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rand.Read(b)
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data = append(data, b)
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}
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ctab := crc32.MakeTable(crc32.Castagnoli)
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total := uint32(0)
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b.Run("direct", func(b *testing.B) {
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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total += crc32.Checksum(data[i%1000], ctab)
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}
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})
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b.Run("hash-reuse", func(b *testing.B) {
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b.ReportAllocs()
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h := crc32.New(ctab)
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for i := 0; i < b.N; i++ {
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h.Reset()
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h.Write(data[i%1000])
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total += h.Sum32()
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}
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})
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b.Run("hash-new", func(b *testing.B) {
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b.ReportAllocs()
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for i := 0; i < b.N; i++ {
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h := crc32.New(ctab)
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h.Write(data[i%1000])
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total += h.Sum32()
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}
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})
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fmt.Println(total)
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}
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