虽然ab可以配置的参数选项比较多，但是，一般情况下我们只需要使用形如ab -n 数字 -c 数字 url路径的命令即可。譬如，我们对位于本地Apache服务器上、URL为localhost/index.php的页面进行压力测试。测试总次数为1000，并发数为100(相当于100个用户同时访问，他们总共访问1000次)。我们输入DOS命令ab -n 1000 -c 100 localhost/index.php，打印结果如下：
F:Apache2.2in>ab -n 1000 -c 100 localhost/index.php
This is ApacheBench， Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss， Zeus Technology Ltd， http://www.zeustech.net/
Licensed to The Apache Software Foundation， http://www.apache.org/
Benchmarking localhost (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests
Server Software:        Apache/2.2.25 (服务器软件名称及版本信息)
Server Hostname:        localhost (服务器主机名)
Server Port:            80 (服务器端口)
Document Path:          /index.php (供测试的URL路径)
Document Length:        10 bytes (供测试的URL返回的文档大小)
Concurrency Level:      100 (并发数)
Time taken for tests:   0.247 seconds (压力测试消耗的总时间)
Complete requests:      1000 (压力测试的总次数)
Failed requests:        0 (失败的请求数)
Write errors:           0 (网络连接写入错误数)
Total transferred:      198000 bytes (传输的总数据量)
HTML transferred:       10000 bytes (HTML文档的总数据量)
Requests per second:    4048.34 [#/sec] (mean) (平均每秒的请求数)
Time per request:       24.701 [ms] (mean) (所有并发用户(这里是100)都请求一次的平均时间)
Time per request:       0.247 [ms] (mean， across all concurrent requests) (单个用户请求一次的平均时间)
Transfer rate:          782.78 [Kbytes/sec] received (传输速率，单位：KB/s)
Connection Times (ms)
min  mean[+/-sd] median   max
Connect:        0    0   0.3      0       1
Processing:     6   23   4.2     24      30
Waiting:        5   20   5.3     21      29
Total:          6   23   4.2     24      30
Percentage of the requests served within a certain time (ms)
50%     24
66%     25
75%     26
80%     26
90%     27
95%     27
98%     28
99%     29
     30 (longest request)
　　在上面的测试中，我们设置的压力测试总次数以及并发数并没有让服务器感觉到什么「压力」，现在我们再来看一个「压力山大」的执行命令：ab -n 100000 -c 1000 localhost/index.php，这个时候apache直接罢工——拒绝访问了：
　　F:Apache2.2in>ab -n 100000 -c 1000 localhost/index.php
　　This is ApacheBench， Version 2.3 <$Revision: 655654 $>
　　Copyright 1996 Adam Twiss， Zeus Technology Ltd， http://www.zeustech.net/
　　Licensed to The Apache Software Foundation， http://www.apache.org/
　　Benchmarking localhost (be patient)
　　Test aborted after 10 failures
　　apr_socket_connect(): 由于目标计算机积极拒绝，无法连接。