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ab 测试
应用 ab 进行页面的压力测试
ab 是 apache 自带的一个很好用的压力测试工具，当装置完 apache 的时候，就能够在 bin 上面找到 ab
1 咱们能够模仿 100 个并发用户，对一个页面发送 1000 个申请
./ab -n1000 -c100
其中 - n 代表申请数，- c 代表并发数
返回后果:
首先是 apache 的版本信息
This is ApacheBench, Version 2.3 <Revision:655654Revision:655654>
Copyright 1996 Adam Twiss, Zeus Technology Ltd,
Licensed to The Apache Software Foundation,
Benchmarking vm1.jianfeng.com (be patient)
Server Software: Apache/2.2.19 ##apache 版本
Server Hostname: vm1.jianfeng.com ## 申请的机子
Server Port: 80 ## 申请端口
Document Path: /a.html
Document Length: 25 bytes ## 页面长度
Concurrency Level: 100 ## 并发数
Time taken for tests: 0.273 seconds ## 共应用了多少工夫
Complete requests: 1000 ## 申请数
Failed requests: 0 ## 失败申请
Write errors: 0
Total transferred: 275000 bytes ## 总共传输字节数，蕴含 http 的头信息等
HTML transferred: 25000 bytes ##html 字节数，理论的页面传递字节数
Requests per second: 3661.60 [#/sec] (mean) ## 每秒多少申请，这个是十分重要的参数数值，服务器的吞吐量
Time per request: 27.310 [ms] (mean) ## 用户均匀申请等待时间
Time per request: 0.273 [ms] (mean, across all concurrent requests) ## 服务器均匀解决工夫，也就是服务器吞吐量的倒数
Transfer rate: 983.34 [Kbytes/sec] received ## 每秒获取的数据长度
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 1 2.3 0 16
Processing: 6 25 3.2 25 32
Waiting: 5 24 3.2 25 32
Total: 6 25 4.0 25 48
Percentage of the requests served within a certain time (ms)
50% 25 ## 50% 的申请在 25ms 内返回
66% 26 ## 60% 的申请在 26ms 内返回
75% 26
80% 26
90% 27
95% 31
98% 38
99% 43
100% 48 (longest request)
2 ab 也能够运行在 windows 中，如果在 windows 下装置 apache, 就能够在 bin 下找到 ab.exe
间接就能够应用，不必依赖其余的 dll
上面是我应用 ab.exe 测试新浪一个页面的后果网页核心：
C:\Users\nickyjf\Desktop\useful>ab -n1000 -c100
This is ApacheBench, Version 2.3 <Revision:655654Revision:655654>
Copyright 1996 Adam Twiss, Zeus Technology Ltd,
Licensed to The Apache Software Foundation,
Benchmarking sports.sina.com.cn (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/2.0.63
Server Hostname: sports.sina.com.cn
Server Port: 80
Document Path: /k/2011-05-24/12095590365.shtml
Document Length: 86680 bytes
Concurrency Level: 100
Time taken for tests: 66.453 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 87135790 bytes
HTML transferred: 86680000 bytes
Requests per second: 15.05 [#/sec] (mean)
Time per request: 6645.294 [ms] (mean)
Time per request: 66.453 [ms] (mean, across all concurrent requests)
Transfer rate: 1280.51 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 1 56 398.3 2 3003
Processing: 89 6331 2603.7 6293 14626
Waiting: 2 1748 1485.9 1590 6284
Total: 90 6388 2615.0 6302 14627
Percentage of the requests served within a certain time (ms)
50% 6302
66% 7121
75% 8435
80% 9193
90% 9231
95% 9385
98% 11549
99% 12459
100% 14627 (longest request)