ApacheBench学习

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ab 的全称是 ApacheBench ，是 Apache 附带的一个小工具，专门用于 HTTP Server 的 benchmark testing ，可以同时模拟多个并发请求。一般开发人员在进行真正的压力测试之前可以使用这个工具来进行自测，从而更好地掌握性能。

首先进入安装Apache下的bin目录，比如在我本机就是C:\Program Files\Apache Software Foundation\Apache2.2\bin，较常用的参数是n和c,

-n1000，指定总请求数，-c10，指定并发数

运行命令 ab -n 10000 -c 100 http://renmai-dev.china.alibaba.com/view/attention/index/1.html 和结果如下：

运行结果代码(重要参数：request per seconde 服务器每秒请求处理数)

C:\Program Files\Apache Software Foundation\Apache2.2\bin>ab -n 10000 -c 100 http://renmai-dev.china.alibaba.com/view/attention/index/1.html

This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Copyright 2006 The Apache Software Foundation, http://www.apache.org/Benchmarking renmai-dev.china.alibaba.com (be patient)Completed 1000 requestsCompleted 2000 requestsCompleted 3000 requestsCompleted 4000 requestsCompleted 5000 requestsCompleted 6000 requestsCompleted 7000 requestsCompleted 8000 requestsCompleted 9000 requestsFinished 10000 requestsServer Software:        Apache-Coyote/1.1Server Hostname:        renmai-dev.china.alibaba.comServer Port:            80Document Path:          /view/attention/index/1.htmlDocument Length:        0 bytesConcurrency Level:      100Time taken for tests:   17.812500 secondsComplete requests:      10000Failed requests:        0Write errors:           0Non-2xx responses:      10000Total transferred:      10130006 bytesHTML transferred:       0 bytesRequests per second:    561.40 [#/sec] (mean)Time per request:       178.125 [ms] (mean)Time per request:       1.781 [ms] (mean, across all concurrent requests)Transfer rate:          555.34 [Kbytes/sec] receivedConnection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   1.8      0      31Processing:    15  176 101.5    140    1125Waiting:       15  176 101.3    140    1125Total:         15  177 101.5    140    1125Percentage of the requests served within a certain time (ms)  50%    140  66%    156  75%    171  80%    171  90%    281  95%    421  98%    484  99%    609 100%   1125 (longest request)

请注意并发数最大为1024，取值不可大于此。接下来，比较一下压力更大的情况。