compare channel and atomic

channel_or_atomic.go

/*
2018/01/15 21:53:31 put testing
2018/01/15 21:53:34 channel used: 2.570561041
2018/01/15 21:53:34 atomic used: 0.505121807
2018/01/15 21:53:34 take testing
2018/01/15 21:53:37 channel used: 2.329268454
2018/01/15 21:53:37 atomic used: 0.498186081
*/

package main

import (
	"log"
	"sync/atomic"
	"time"
)

func main() {
	log.Println("put testing")
	num := int(1e8)

	var (
		start time.Time
	)

	C := make(chan struct{}, num)
	start = time.Now()
	for i := 0; i < num; i++ {
		C <- struct{}{}
	}
	log.Println("channel used:", time.Now().Sub(start).Seconds())

	start = time.Now()
	var n int64
	for i := 0; i < num; i++ {
		atomic.AddInt64(&n, 1)
	}
	log.Println("atomic used:", time.Now().Sub(start).Seconds())

	log.Println("take testing")
	start = time.Now()
	for i := 0; i < num; i++ {
		<-C
	}
	log.Println("channel used:", time.Now().Sub(start).Seconds())

	start = time.Now()
	for i := 0; i < num; i++ {
		atomic.AddInt64(&n, -1)
	}
	log.Println("atomic used:", time.Now().Sub(start).Seconds())

}