2.3 实例

　　假设我们要测试一个PHP论坛系统，其中一个性能测试用例是：“同时处理50个并发请求并运行 1000 次index.php 首页”，我们可以在cmd shell中输入 ab -n 1000 -c 50 http://172.16.11.180:88/bbs/index.php，运行结束后，ab会自动显示测试结果，如下：

　 　E:WebserApache2bin>ab -n 1000 -c 50 http://172.16.11.180:88/bbs/index.php
　　This is ApacheBench, Version 2.0.41-dev <$Revision: 1.121.2.12 $> apache-2.0
　　Copyright (c) 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
　　Copyright (c) 1998-2002 The Apache Software Foundation, http://www.apache.org/
　　Benchmarking 172.16.11.180 (be patient)
　　Completed 100 requests
　　Completed 200 requests
　　Completed 300 requests
　　Completed 400 requests
　　Completed 500 requests
　　Completed 600 requests
　　Completed 700 requests
　　Completed 800 requests
　　Completed 900 requests
　　Finished 1000 requests
　　Server Software: Apache
　　Server Hostname: 172.16.11.180
　　Server Port: 88
　　Document Path: /bbs/index.php
　　Document Length: 36962 bytes
　　Concurrency Level: 50
　　Time taken for tests: 262.515625 seconds
　　Complete requests: 1000
　　Failed requests: 198
　　(Connect: 0, Length: 198, Exceptions: 0)
　　Write errors: 0
　　Total transferred: 37408432 bytes
　　HTML transferred: 36967364 bytes
　　Requests per second: 3.81 [#/sec] (mean)
　　Time per request: 13125.781 [ms] (mean)
　　Time per request: 262.516 [ms] (mean, across all concurrent requests)
　　Transfer rate: 139.16 [Kbytes/sec] received
　　Connection Times (ms)
　　min mean[+/-sd] median max
　　Connect: 0 1 4.5 0 15
　　Processing: 297 12818 2427.6 12921 30578
　　Waiting: 281 12801 2427.6 12906 30562
　　Total: 312 12820 2427.5 12921 30578
　　Percentage of the requests served within a certain time (ms)
　　50% 12921
　　66% 13203
　　75% 13453
　　80% 13546
　　90% 13781
　　95% 14156
　　98% 14750
　　99% 18328
　　100% 30578 (longest request)

　　以上结果指出，在并发50个请求的情况下，完成1000次的访问请求，共花了262.515秒，这个程序每秒可处理3.81个请求。