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Apache自带的压力测试工具，还有一个独立版本。主要用于测试网站的每秒处理请求数，多用于静态压力测试。基本用法是：


ab -n 1100 -c 50 http://1vg5062570.51mypc.cn/

-n	总请求数
-c	并发连接数

输出的结果如下:

Server Software:        Apache/2.2.16
Server Hostname:        192.168.1.101
Server Port:            80

Document Path:          /                               请求文档路径
Document Length:        14643 bytes                     请求文档大小

Concurrency Level:      50                              并发数
Time taken for tests:   38.724 seconds                  总测试时间
Complete requests:      1000                            全部请求数
Failed requests:        14                              失败请求数
   (Connect: 0, Receive: 0, Length: 14, Exceptions: 0)
Write errors:           14
Total transferred:      14847500 bytes                  总数据传输量
HTML transferred:       14548500 bytes                  HTML数据传输量
Requests per second:    25.82 [#/sec] (mean)            平均每秒请求数
Time per request:       1936.210 [ms] (mean)            平均每次并发所有请求时间
Time per request:       38.724 [ms] (mean, across all concurrent requests)
                                                        平均每次请求时间
Transfer rate:          374.43 [Kbytes/sec] received    传输速率

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        2  668 1905.0    135   12237            连接时间
Processing:     0 1244 1652.3    902   14963            处理时间
Waiting:        0 1222 1651.1    883   14955            等待时间
Total:        134 1912 2723.5   1126   15096

Percentage of the requests served within a certain time (ms)
  50%   1126
  66%   1321
  75%   1369
  80%   1408
  90%   1917
  95%  10122
  98%  13030
  99%  13884
 100%  15096 (longest request)

参考文献：

网站压力测试工具 (yeolar.com)http://www.yeolar.com/note/2012/11/24/web-bench-test/