在Apache中有自带的ab命令可以测试服务的压力，而nginx没有自带的命令，必须要采用第三方软件来测试，今天就简单介绍一下webbench对nginx的压力测试，压力测试是对系统管理员和运维人员必须的，可以很清晰地看清服务器能接受多大压力.注:本人是在虚拟机上做测试。

1.下载webbench软件和安装

wget http://home.tiscali.cz/~cz210552/distfiles/webbench-1.5.tar.gz

tar xvf webbench-1.5.tar.gz  -C /usr/local/

cd /usr/local/webbench-1.5/

make

make install 

2.命令详解

[root@CentOS179min webbench-1.5]# ./webbench -help                                    
webbench [option]... URL
  -f|--force              Don't wait for reply from server.
  -r|--reload              Send reload request - Pragma: no-cache.
  -t|--time <sec>          Run benchmark for <sec> seconds. Default 30.
  -p|--proxy <server:port> Use proxy server for request.
  -c|--clients <n>        Run <n> HTTP clients at once. Default one.
  -9|--http09              Use HTTP/0.9 style requests.
  -1|--http10              Use HTTP/1.0 protocol.
  -2|--http11              Use HTTP/1.1 protocol.
  --get                    Use GET request method.
  --head                  Use HEAD request method.
  --options                Use OPTIONS request method.
  --trace                  Use TRACE request method.
  -?|-h|--help            This information.
  -V|--version            Display program version.
[root@centos179min webbench-1.5]# 

3.测试网站压力

[root@centos179min webbench-1.5]# ./webbench -c 200 -t 10 http://192.168.1.179/test.php
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.

Benchmarking: GET http://192.168.1.179/test.php
200 clients, running 10 sec.

Speed=58386 pages/min, 51328516 bytes/sec.    --每秒钟响应请求数:Speed=58386 pages/min,每秒钟传输数据量:51328516 bytes/sec

Requests: 9731 susceed, 0 failed.                      --10秒200个客户端请求没有失败

[root@centos179min webbench-1.5]# ./webbench -c 1000 -t 10 http://192.168.1.179/test.php
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.

Benchmarking: GET http://192.168.1.179/test.php
1000 clients, running 10 sec.

Speed=47916 pages/min, 42126676 bytes/sec.
Requests: 7986 susceed, 0 failed.                  --10秒1000个客户端请求也没有失败

[root@centos179min webbench-1.5]# ./webbench -c 2000 -t 10 http://192.168.1.179/test.php
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.

Benchmarking: GET http://192.168.1.179/test.php
2000 clients, running 10 sec.

Speed=50394 pages/min, 44303164 bytes/sec.
Requests: 8399 susceed, 0 failed.                    --10秒中内发2000个请求也没有失败

[root@centos179min webbench-1.5]# ./webbench -c 4000 -t 10 http://192.168.1.179/test.php
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.

Benchmarking: GET http://192.168.1.179/test.php
4000 clients, running 10 sec.

Speed=46644 pages/min, 40894852 bytes/sec.
Requests: 7749 susceed, 25 failed.              --10秒内4000客户端发送请求就有25个失败,证明10秒并发不超过4000,注nginx没有做过忧化
[root@centos179min webbench-1.5]#