内容简介：ApacheBench是命令行下一个常用的HTTP服务压力测试工具。默认情况下，ApacheBench只进行一次测试。
ApacheBench是命令行下一个常用的HTTP服务压力测试工具。
ApacheBench使用示例
1. 测试百度首页一次
ab www.baidu.com/
默认情况下，ApacheBench只进行一次测试。
注意: URL必须至少有一个斜杠，否则ApacheBench不识别。
控制台输出
This is ApacheBench, Version 2.3 <$Revision: 1826891 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking www.baidu.com (be patient).....done
Server Software: BWS/1.1
Server Hostname: www.baidu.com
Server Port: 80
Document Path: /
Document Length: 153011 bytes
Concurrency Level: 1
Time taken for tests: 0.048 seconds
Complete requests: 1
Failed requests: 0
Total transferred: 153973 bytes
HTML transferred: 153011 bytes
Requests per second: 21.04 [#/sec] (mean)
Time per request: 47.533 [ms] (mean)
Time per request: 47.533 [ms] (mean, across all concurrent requests)
Transfer rate: 3163.37 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 12 12 0.0 12 12
Processing: 35 35 0.0 35 35
Waiting: 13 13 0.0 13 13
Total: 48 48 0.0 48 48
2. 压测百度首页，4并发共40个请求
ab -n 40 -c 4 www.baidu.com/
控制台输出
This is ApacheBench, Version 2.3 <$Revision: 1826891 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking www.baidu.com (be patient).....done
Server Software: BWS/1.1
Server Hostname: www.baidu.com
Server Port: 80
Document Path: /
Document Length: 153337 bytes
Concurrency Level: 4
Time taken for tests: 5.136 seconds
Complete requests: 40
Failed requests: 39
(Connect: 0, Receive: 0, Length: 39, Exceptions: 0)
Total transferred: 6166547 bytes
HTML transferred: 6127863 bytes
Requests per second: 7.79 [#/sec] (mean)
Time per request: 513.563 [ms] (mean)
Time per request: 128.391 [ms] (mean, across all concurrent requests)
Transfer rate: 1172.59 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 4 61 234.6 6 1086
Processing: 30 407 568.1 297 3302
Waiting: 6 18 41.0 10 266
Total: 34 468 610.2 316 3309
Percentage of the requests served within a certain time (ms)
50% 316
66% 433
75% 584
80% 671
90% 1088
95% 1757
98% 3309
99% 3309
100% 3309 (longest request)
可见，这些请求最短耗时34毫秒，最长耗时3309毫秒，平均耗时468毫秒
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