利用Apache附带ab来经行压力测试

第一步：安装
　　　　

apt-get install apache2-utils

　如果系统没有更新请先更新系统资源

apt-get update

　安装完成后输入以下命令，查看版本

~# ab -V

This is ApacheBench, Version 2.3 <$Revision: 1528965 $>

Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://

Licensed to The Apache Software Foundation, http:

第二步：测试
　　　

 ab -c 10 -n 100

 -c 10 并发用户数
－n 100 总请求数

This is ApacheBench, Version 2.3 <$Revision: 1528965 $>
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).....done


Server Software: Apache-Coyote/1.1
Server Hostname: localhost
Server Port: 80

Document Path: /index.jsp
Document Length: 203 bytes　//响应数据的长度

Concurrency Level: 10　// 并发用户数，参数
Time taken for tests: 0.145 seconds   // 所有请求被处理完成所花费的总时间
Complete requests: 100   // 总请求数
Failed requests: 77     // 失败的请求数
   (Connect: 0, Receive: 0, Length: 77, Exceptions: 0)
Total transferred: 93875 bytes
HTML transferred: 77823 bytes
Requests per second: 688.21 [#/sec] (mean)     //吞吐率
Time per request: 14.530 [ms] (mean)    // 用户平均请求等待时间
Time per request: 1.453 [ms] (mean, across all concurrent requests)   // 服务器平均请求处理时间
Transfer rate: 630.92 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect: 0    0   0.6      0       3
Processing: 0    9  21.8      2     138
Waiting: 0    8  21.6      1     138
Total: 1    9  21.8      2     139

Percentage of the requests served within a certain time (ms)
  50%      2
  66%      3
  75%      3
  80%      3
  90%     55
  95%     57
  98%     99
  99%    139
 100%    139 (longest request)

第三步：数据统计查找最优
　　

并发用户数	请求等待时间(ms)	请求处理时间(ms)	吞吐率（reqs/s）
1	0.316	0.316	3164.12
5	1.267	0.253	3946.41
10	2.693	0.269	3713.81
20	6.365	0.318	3142.07
50	13.876	0.278	3603.32
100	26.831	0.268	3727.02
200	52.462	0.262	3812.27
400	114.739	0.287	3486.17
600	182.193	0.304	3293.21
800	227.7	0.285	3513.39