golang channel benchmark

chan_test.go

package chan_test

import (
	"testing"
)

func BenchmarkStructChan(b *testing.B) {
	ch := make(chan struct{})
	go func() {
		for {
			<-ch
		}
	}()
	for i := 0; i < b.N; i++ {
		ch <- struct{}{}
	}
}

func BenchmarkBoolChan(b *testing.B) {
	ch := make(chan bool)
	go func() {
		for {
			<-ch
		}
	}()
	for i := 0; i < b.N; i++ {
		ch <- true
	}
}

func BenchmarkIntChan(b *testing.B) {
	ch := make(chan int)
	go func() {
		for {
			<-ch
		}
	}()
	for i := 0; i < b.N; i++ {
		ch <- 1
	}
}

To add onto that, if you were really trying to send one item at a time, you should be using a mutex from sync.

Here's what I got on a 2 vCPU (Haswell 3GHz) VPS with 1.6.2 and 1.9.2.

$ go version
go version go1.6.2 linux/amd64
$ go test -test.bench Bench
testing: warning: no tests to run
PASS
BenchmarkStructChan-2	 5000000	       260 ns/op
BenchmarkBoolChan-2  	 5000000	       283 ns/op
BenchmarkIntChan-2   	 5000000	       264 ns/op
ok  	_/root/test	4.948s

$ go version
go version go1.9.2 linux/amd64
$ go test -test.bench Bench
goos: linux
goarch: amd64
BenchmarkStructChan-2   	10000000	       258 ns/op
BenchmarkBoolChan-2     	 5000000	       243 ns/op
BenchmarkIntChan-2      	10000000	       234 ns/op
PASS
ok  	_/root/test	5.650s