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c36d574290
This adds various new locks to replace the single big lock on the head. All parts now must be COW as they may be held by clients after initial retrieval. Series by ID and hashes are now held in a stripe lock to reduce contention and total holding time during GC. This should reduce starvation of readers.
79 lines
1.8 KiB
Go
79 lines
1.8 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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"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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