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atomic_test.go
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atomic_test.go
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package benchmarks
import (
"runtime"
"sync"
"sync/atomic"
"testing"
)
func BenchmarkAtomicSwap(b *testing.B) {
var v uint32
for i := 0; i < b.N; i++ {
atomic.SwapUint32(&v, uint32(i))
}
}
func BenchmarkAtomicCompareAndSwapSuccess(b *testing.B) {
var v uint32
for i := 1; i < b.N+1; i++ {
atomic.CompareAndSwapUint32(&v, uint32(i-1), uint32(i))
}
}
func BenchmarkAtomicCompareAndSwapFail(b *testing.B) {
var v uint32
for i := 0; i < b.N; i++ {
atomic.CompareAndSwapUint32(&v, 1, uint32(i))
}
}
func BenchmarkAtomicCompareAndSwapFailContended(b *testing.B) {
var v uint32
var wg sync.WaitGroup
n := runtime.GOMAXPROCS(0)
for i := 0; i < n; i++ {
wg.Add(1)
go func() {
defer wg.Done()
for i := 0; i < b.N/n; i++ {
atomic.CompareAndSwapUint32(&v, 1, uint32(i))
}
}()
}
wg.Wait()
}
func BenchmarkAtomicLoad(b *testing.B) {
var v uint32
for i := 0; i < b.N; i++ {
_ = atomic.LoadUint32(&v)
}
}
func BenchmarkAtomicLoadContended(b *testing.B) {
var v uint32
var wg sync.WaitGroup
n := runtime.GOMAXPROCS(0)
for i := 0; i < n; i++ {
wg.Add(1)
go func() {
defer wg.Done()
for i := 0; i < b.N/n; i++ {
_ = atomic.LoadUint32(&v)
}
}()
}
wg.Wait()
}