github地址：https://github.com/wg/wrk
一、安装
Mac
```
$ brew install wrk
```
Ubuntu/Debian
```
sudo apt-get update
sudo apt-get install build-essential libssl-dev git -y
git clone https://github.com/wg/wrk.git wrk
cd wrk
sudo make
#move the executable to somewhere in your PATH, ex:
sudo cp wrk /usr/local/bin
```
CentOS / RedHat / Fedora
```
sudo yum groupinstall'Development Tools'
sudo yum install openssl-devel
sudo yum install gitgit clone https://github.com/wg/wrk.git wrk
cd wrk
make
#move the executable to somewhere in your PATH
sudo cp wrk /somewhere/in/your/PATH
```
其他系统参考：https://github.com/wg/wrk/wiki
二、使用
wrk的使用非常简单
一行命令搞定
wrk -t12 -c400 -d30s http://127.0.0.1:8080/index.html
运行30s，开启12线程，总共保持400个HTTP连接开启
三、wrk报告
Running 30s test @ http://127.0.0.1:8080/index.html
12 threads and 400 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 635.91us 0.89ms 12.92ms 93.69%
Req/Sec 56.20k 8.07k 62.00k 86.54%
22464657 requests in 30.00s, 17.76GB read
Requests/sec: 748868.53
Transfer/sec: 606.33MB
结果也不难理解。
latency那一行反映了请求响应时间，分别为平均值，标准差，最大值，正负一个标准差内的比例；
transfer为数据交换量。
其他都很好理解，无须解释了。
