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channel_test.go
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package benchmarks
import (
"testing"
"runtime"
"sync"
)
func BenchmarkChannelOneByte(b *testing.B) {
ch := make(chan byte, 4096)
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
for range ch {
}
}()
b.SetBytes(1)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
ch <- byte(i)
}
close(ch)
wg.Wait()
}
func BenchmarkChannelOneByteUnbuffered(b *testing.B) {
ch := make(chan byte)
wg := sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
for range ch {
}
}()
b.SetBytes(1)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
ch <- byte(i)
}
close(ch)
wg.Wait()
}
func BenchmarkChannelOneByteMultiReceive(b *testing.B) {
ch := make(chan byte, 4096)
wg := sync.WaitGroup{}
for i := 0; i < runtime.NumCPU(); i++ {
wg.Add(1)
go func() {
defer wg.Done()
for range ch {
}
}()
}
b.SetBytes(1)
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
ch <- byte(i)
}
close(ch)
wg.Wait()
}
func BenchmarkChannelOneByteMultiSendRecv(b *testing.B) {
ch := make(chan byte, 4096)
wg := sync.WaitGroup{}
numCPU := runtime.NumCPU()
wg.Add(numCPU)
for i := 0; i < numCPU; i++ {
go func() {
for range ch {
}
wg.Done()
}()
}
b.SetBytes(1)
b.ReportAllocs()
b.ResetTimer()
sendWG := sync.WaitGroup{}
sendWG.Add(numCPU)
for j := 0; j < numCPU; j++ {
go func() {
for i := 0; i < b.N; i += numCPU {
ch <- byte(i)
}
sendWG.Done()
}()
}
sendWG.Wait()
close(ch)
wg.Wait()
}
func BenchmarkChannelOneByteMultiSendRecvUnbuffered(b *testing.B) {
ch := make(chan byte)
wg := sync.WaitGroup{}
numCPU := runtime.NumCPU()
wg.Add(numCPU)
for i := 0; i < numCPU; i++ {
go func() {
for range ch {
}
wg.Done()
}()
}
b.SetBytes(1)
b.ReportAllocs()
b.ResetTimer()
sendWG := sync.WaitGroup{}
sendWG.Add(numCPU)
for j := 0; j < numCPU; j++ {
go func() {
for i := 0; i < b.N; i += numCPU {
ch <- byte(i)
}
sendWG.Done()
}()
}
sendWG.Wait()
close(ch)
wg.Wait()
}