bench2.go

bench2.go

package main

import (
	"bytes"
	"flag"
	"fmt"
	"log"
	"net"
	"os"
	"runtime"
	"runtime/pprof"
	"time"
)

var request = []byte("PING\r\n")

var cpuProfile = flag.String("cpuprofile", "", "write cpu profile to file, e.g proxy.prof")
var w = flag.Int("w", 10, "worker number")
var dur = flag.Duration("time", 10*time.Second, "time to run benchmark")

func worker(counters chan int, exit chan int) {
	counter := 0

	conn, err := net.DialTimeout("tcp", ":6379", 3*time.Second)
	if err != nil {
		panic(err)
	}
	defer conn.Close()

	reply := make([]byte, 100)

	for {
		select {
		case <-exit:
			counters <- counter
			return
		default:
			_, err = conn.Write(request)
			if err != nil {
				panic(err)
			}

			n, err := conn.Read(reply)
			if err != nil {
				panic(err)
			}

			if !bytes.Equal(reply[:n], []byte("+PONG\r\n")) {
				panic(`got "` + string(reply[:n]) + `", expected +PONG`)
			}

			counter++
		}
	}
}

func main() {
	runtime.GOMAXPROCS(2)

	flag.Parse()

	if *cpuProfile != "" {
		f, err := os.Create(*cpuProfile)
		if err != nil {
			log.Fatal(err)
		}
		err = pprof.StartCPUProfile(f)
		if err != nil {
			log.Fatal(err)
		}
		defer pprof.StopCPUProfile()
	}

	counters := make(chan int)
	exits := make([]chan int, 0, *w)
	for i := 0; i < *w; i++ {
		exit := make(chan int)
		exits = append(exits, exit)
		go worker(counters, exit)
	}

	time.Sleep(*dur)

	for _, exit := range exits {
		exit <- 1
	}

	counter := 0
	for i := 0; i < *w; i++ {
		counter += <-counters
	}

	fmt.Printf("Requests: %v\n", counter)
}