Web 压力测试工具 --Apache AB
AB(ApacheBench)是Apache自带的超文本传输协议(HTTP)性能测试工具。 其设计意图是描绘当前所安装的Apache的执行性能， 主要是显示Apache每秒可以处理多少个请求。
该工具是Apache自带的工具。 安装了Apache Http Server， 就有了ap 程序。 Apache Server 可以从Apache 官网直接下载：
http://httpd.apache.org/download.cgi#apache22
安装完后，在apache的Bin目录下有ab.exe 程序。 这个就是我们的AB工具。
AB 工具的使用方法：
C: >cd C:/Program Files (x86)/Apache Software Foundation/Apache2.2/bin
C:/Program Files (x86)/Apache Software Foundation/Apache2.2/bin>ab
ab: wrong number of arguments
Usage: ab [options] [http://]hostname[:port]/path
Options are:
-n requests Number of requests to perform
-c concurrency Number of multiple requests to make
-t timelimit Seconds to max. wait for responses
-b windowsize Size of TCP send/receive buffer, in bytes
-p postfile File containing data to POST. Remember also to set -T
-u putfile File containing data to PUT. Remember also to set -T
-T content-type Content-type header for POSTing, eg.
'application/x-www-form-urlencoded'
Default is 'text/plain'
-v verbosity How much troubleshooting info to print
-w Print out results in HTML tables
-i Use HEAD instead of GET
-x attributes String to insert as table attributes
-y attributes String to insert as tr attributes
-z attributes String to insert as td or th attributes
-C attribute Add cookie, eg. 'Apache=1234. (repeatable)
-H attribute Add Arbitrary header line, eg. 'Accept-Encoding: gzip'
Inserted after all normal header lines. (repeatable)
-A attribute Add Basic WWW Authentication, the attributes
are a colon separated username and password.
-P attribute Add Basic Proxy Authentication, the attributes
are a colon separated username and password.
-X proxy:port Proxyserver and port number to use
-V Print version number and exit
-k Use HTTP KeepAlive feature
-d Do not show percentiles served table.
-S Do not show confidence estimators and warnings.
-g filename Output collected data to gnuplot format file.
-e filename Output CSV file with percentages served
-r Don't exit on socket receive errors.
-h Display usage information (this message)
C:/Program Files (x86)/Apache Software Foundation/Apache2.2/bin>
示例：
C:/Program Files (x86)/Apache Software Foundation/Apache2.2/bin>ab -n 1000 -c 50 http://blog.csdn.net/tianlesoftware/archive/2010/05/25/5622268.aspx
-- 注意， 这里要写一个具体的页面
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 blog.csdn.net (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: nginx/0.7.65
Server Hostname: blog.csdn.net
Server Port: 80
Document Path: /tianlesoftware/archive/2010/05/25/5622268.aspx --请求资源
Document Length: 169 bytes --文档返回的长度，不包括相应头
Concurrency Level: 50 --并发个数
Time taken for tests: 118.549 seconds --请求消耗总时间
Complete requests: 1000 --总请求数
Failed requests: 1
(Connect: 1, Receive: 0, Length: 0, Exceptions: 0)
Write errors: 0
Non-2xx responses: 1000
Total transferred: 334000 bytes
HTML transferred: 169000 bytes
Requests per second: 8.44 [#/sec] (mean) --平均每秒请求数
Time per request: 5927.439 [ms] (mean) --平均每个请求时间
Time per request: 118.549 [ms] (mean, across all concurrent requests)
--平均每个请求时间除以并发数， 这里是5927.439/50
Transfer rate: 2.75 [Kbytes/sec] received -- 时间传输速率
Connection Times (ms)
min mean[+/-sd] median max
Connect: 47 97 72.8 63 742
Processing: 57 5720 4597.9 4666 25381
Waiting: 54 2711 3312.5 2128 25176
Total: 112 5817 4595.1 4754 25435
Percentage of the requests served within a certain time (ms)
50% 4754 --
66% 5491
75% 6005
80% 6274
90% 7366
95% 8697
98% 25232
99% 25415
100% 25435 (longest request)
C:/Program Files (x86)/Apache Software Foundation/Apache2.2/bin>
含义： 同时处理50个并发请求并运行 1000 次:
/tianlesoftware/archive/2010/05/25/5622268.aspx
结果： 在并发50个请求的情况下，完成1000次的访问请求，共花了118.549秒，这个程序每秒可处理8.44个请求。
小结：
测试AB的时候，随便在自己的Blog上找了一个网页， 结果测完之后，Blog 就打不开了。 杯具啊。 过了十几分钟才恢复。 下次测试不拿自己的blog 玩了。 - -
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Blog： http://blog.csdn.net/tianlesoftware
网上资源： http://tianlesoftware.download.csdn.net
相关视频：http://blog.csdn.net/tianlesoftware/archive/2009/11/27/4886500.aspx
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