forked from mirror/ants
73 lines
1.5 KiB
Go
73 lines
1.5 KiB
Go
// Copyright 2021 Andy Pan & Dietoad. All rights reserved.
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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package internal
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import (
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"runtime"
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"sync"
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"sync/atomic"
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"testing"
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)
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/*
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Benchmark result for three types of locks:
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goos: darwin
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goarch: amd64
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pkg: git.internal/re/ants/v2/internal
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cpu: Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
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BenchmarkMutex-12 20549502 71.84 ns/op 0 B/op 0 allocs/op
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BenchmarkSpinLock-12 58629697 20.02 ns/op 0 B/op 0 allocs/op
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BenchmarkBackOffSpinLock-12 72523454 15.74 ns/op 0 B/op 0 allocs/op
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*/
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type originSpinLock uint32
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func (sl *originSpinLock) Lock() {
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for !atomic.CompareAndSwapUint32((*uint32)(sl), 0, 1) {
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runtime.Gosched()
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}
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}
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func (sl *originSpinLock) Unlock() {
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atomic.StoreUint32((*uint32)(sl), 0)
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}
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func NewOriginSpinLock() sync.Locker {
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return new(originSpinLock)
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}
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func BenchmarkMutex(b *testing.B) {
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m := sync.Mutex{}
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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m.Lock()
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//nolint:staticcheck
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m.Unlock()
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}
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})
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}
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func BenchmarkSpinLock(b *testing.B) {
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spin := NewOriginSpinLock()
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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spin.Lock()
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//nolint:staticcheck
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spin.Unlock()
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}
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})
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}
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func BenchmarkBackOffSpinLock(b *testing.B) {
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spin := NewSpinLock()
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b.RunParallel(func(pb *testing.PB) {
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for pb.Next() {
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spin.Lock()
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//nolint:staticcheck
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spin.Unlock()
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}
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})
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}
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