gistfile1.go

package main

import (
	"flag"
	"fmt"
	"os"
	"time"
	"http"
	"runtime"
)

func main() {
	runtime.GOMAXPROCS(4)

	var rate *int = flag.Int("rate", 1, "requests per second")
	var url *string = flag.String("url", "", "target URL")

	flag.Parse()

	if *url == "" {
		fmt.Fprintf(os.Stderr, "error: empty URL\n")
		os.Exit(1)
	}

	go func() {
		for {
			time.Sleep(int64(5000000000))
			fmt.Fprintf(os.Stderr, "# goroutines: %d\n", runtime.Goroutines())
		}
	}()

	for {
		go doRequest(*url)
		time.Sleep(int64(1000000000 / *rate))
	}
}

func doRequest(url string) {
	c := new(http.Client)
	r, err := c.Get(url)
	if err != nil {
		fmt.Fprintf(os.Stderr, "GET %s failed: %v\n", url, err)
		return
	}
	r.Body.Close()
}