lock_test.go

package main

import (
	"sync"
	"testing"
)

func BenchmarkLock(t *testing.B) {
	mu := sync.Mutex{}
	m := make(map[int]bool)

	for i := 0; i < t.N; i++ {
		v := true
		mu.Lock()
		m[1] = v
		mu.Unlock()
	}
}

func BenchmarkChannel(t *testing.B) {
	m := make(map[int]bool)
	c := make(chan bool, 1)
	go func() {
		for x := range c {
			m[1] = x
		}
	}()

	for i := 0; i < t.N; i++ {
		v := true
		c <- v
	}
}

func BenchmarkChannel2(t *testing.B) {
	m := make(map[int]bool)
	c := make(chan bool, 8192)
	go func() {
		for x := range c {
			m[1] = x
		}
	}()

	for i := 0; i < t.N; i++ {
		v := true
		c <- v
	}

}

BenchmarkLock 50000000 44.5 ns/op
BenchmarkChannel 5000000 324 ns/op
BenchmarkChannel2 20000000 106 ns/op