buster

package main

import (
	"fmt"
	"io"
	"io/ioutil"
	"net/http"
	"time"

	"github.com/codahale/buster"
)

func main() {
	// run a bench for 1 minute, tracking latencies from 1µs to 1 minute
	bench := buster.Bench{
		Duration:   1 * time.Minute,
		MinLatency: 1 * time.Microsecond,
		MaxLatency: 1 * time.Minute,
	}

	r := bench.Run(
		10,   // concurrent workers
		1000, // 1000 ops/sec total
		func(id int, gen *buster.Generator) error { // the job to be run
			client := &http.Client{}

			return gen.Do(func() error {
				// perform a GET request
				resp, err := client.Get("http://www.google.com/")
				if err != nil {
					return err
				}

				// read the body
				io.Copy(ioutil.Discard, resp.Body)
				return resp.Body.Close()
			})
		},
	)

	fmt.Println(r)
}

Output: