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。前段时间看到公司的开发人员也在用它作一些测试，看起来也不错，很简单，也很容易使用，所以今天花一点时间看了一下。
通过下面的一个简单的例子和注释，相信大家可以更容易理解这个工具的使用。
一个简单的例子
/* 在这个例子的一开始，我执行了这样一个命令 ab -n 10 -c 10 http://www.google.com/ 。 这个命令的意思是启动 ab ，向 www.google.com 发送10个请求(-n 10) ，并每次发送10个请求 (-c 10)——也就是说一次都发过去了 。跟着下面的是 ab 输出的测试报告，红色部分是我添加的注释。 */
C:\Program Files\Apache Software Foundation\Apache2.2\bin>ab -n 10 -c 10 http
://www.google.com/
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 1997-2005 The Apache Software Foundation, http://www.apache.org/
Benchmarking www.google.com (be patient).....done
Server Software: GWS/2.1
Server Hostname: www.google.com
Server Port: 80
Document Path: /
Document Length: 230 bytes
Concurrency Level: 10
/* 整个测试持续的时间 * /
Time taken for tests: 3.234651 seconds
/* 完成的请求数量 */
Complete requests: 10
/* 失败的请求数量 */
Failed requests: 0
Write errors: 0
Non-2xx responses: 10
Keep-Alive requests: 10
/* 整个场景中的网络传输量 */
Total transferred: 6020 bytes
/* 整个场景中的 HTML 内容传输量 */
HTML transferred: 2300 bytes
/* 大家最关心的指标之一，相当于 LR 中的 每秒事务数 ，后面括号中的 mean 表示这是一个平均值 */
Requests per second: 3.09 [#/sec] (mean)
/* 大家最关心的指标之二，相当于 LR 中的 平均事务响应时间 ，后面括号中的 mean 表示这是一个平均值 */
Time per request: 3234.651 [ms] (mean)
/* 这个还不知道是什么意思，有知道的朋友请留言，谢谢 ^_^ */
Time per request: 323.465 [ms] (mean, across all concurrent requests)
/* 平均每秒网络上的流量，可以帮助排除是否存在网络流量过大导致响应时间延长的问题 */
Transfer rate: 1.55 [Kbytes/sec] received
/* 网络上消耗的时间的分解，各项数据的具体算法还不是很清楚 */
Connection Times (ms)
min mean[+/-sd] median max
Connect: 20 318 926.1 30 2954
Processing: 40 2160 1462.0 3034 3154
Waiting: 40 2160 1462.0 3034 3154
Total: 60 2479 1276.4 3064 3184
/* 下面的内容为整个场景中所有请求的响应情况。在场景中每个请求都有一个响应时间，其中 50 ％ 的用户响应时间小于 3064 毫秒， 60 ％ 的用户响应时间小于 3094 毫秒，最大的响应时间小于 3184 毫秒 */
Percentage of the requests served within a certain time (ms)
50% 3064
66% 3094
75% 3124
80% 3154
90% 3184
95% 3184
98% 3184
99% 3184
100% 3184 (longest request)
更多信息
ab 不像 LR 那么强大，但是它足够轻便，如果只是在开发过程中想检查一下某个模块的响应情况，或者做一些场景比较简单的测试， ab 还是一个不错的选择——至少不用花费很多时间去学习 LR 那些复杂的功能，就更别说那 License 的价格了。
下面是 ab 的详细参数解释，大家有兴趣的可以研究一下，最近没有足够多的时间研究，如果哪位朋友有兴趣希望可以帮忙翻译一下每个参数的含义，有问题讨论也欢迎在这里回帖 ^_^
ab [ - A auth-username : password ] [ - c concurrency ] [ - C cookie-name = value ] [ - d ] [ - ecsv-file ] [ - g gnuplot-file ] [ - h ] [ - H custom-header ] [ - i ] [ - k ] [ - n requests ] [ - pPOST-file ] [ - P proxy-auth-username : password ] [ - q ] [ - s ] [ - S ] [ - t timelimit ] [ - Tcontent-type ] [ - v verbosity ] [ - V ] [ - w ] [ - x <table>-attributes ] [ - X proxy [: port ] ] [ - y<tr>-attributes ] [ - z <td>-attributes ] [http://] hostname [: port ]/ path
-A auth-username : password
Supply BASIC Authentication credentials to the server. The username and password are separated by a single : and sent on the wire base64 encoded. The string is sent regardless of whether the server needs it (i.e. , has sent an 401 authentication needed).
-c concurrency
Number of multiple requests to perform at a time. Default is one request at a time.
-C cookie-name = value
Add a Cookie: line to the request. The argument is typically in the form of a name = value pair. This field is repeatable.
-d
Do not display the "percentage served within XX [ms] table". (legacy support).
-e csv-file
Write a Comma separated value (CSV) file which contains for each percentage (from 1% to 100%) the time (in milliseconds) it took to serve that percentage of the requests. This is usually more useful than the 'gnuplot' file; as the results are already 'binned'.
-g gnuplot-file
Write all measured values out as a 'gnuplot' or TSV (Tab separate values) file. This file can easily be imported into packages like Gnuplot, IDL, Mathematica, Igor or even Excel. The labels are on the first line of the file.
-h
Display usage information.
-H custom-header
Append extra headers to the request. The argument is typically in the form of a valid header line, containing a colon-separated field-value pair (i.e. , "Accept-Encoding: zip/zop;8bit" ).
-i
Do HEAD requests instead of GET .
-k
Enable the HTTP KeepAlive feature, i.e. , perform multiple requests within one HTTP session. Default is no KeepAlive.
-n requests
Number of requests to perform for the benchmarking session. The default is to just perform a single request which usually leads to non-representative benchmarking results.
-p POST-file
File containing data to POST.
-P proxy-auth-username : password
Supply BASIC Authentication credentials to a proxy en-route. The username and password are separated by a single : and sent on the wire base64 encoded. The string is sent regardless of whether the proxy needs it (i.e. , has sent an 407 proxy authentication needed).
-q
When processing more than 150 requests, ab outputs a progress count on stderr every 10% or 100 requests or so. The -q flag will suppress these messages.
-s
When compiled in ( ab -h will show you) use the SSL protected https rather than the http protocol. This feature is experimental and very rudimentary. You probably do not want to use it.
-S
Do not display the median and standard deviation values, nor display the warning/error messages when the average and median are more than one or two times the standard deviation apart. And default to the min/avg/max values. (legacy support).
-t timelimit
Maximum number of seconds to spend for benchmarking. This implies a -n 50000 internally. Use this to benchmark the server within a fixed total amount of time. Per default there is no timelimit.
-T content-type
Content-type header to use for POST data.
-v verbosity
Set verbosity level - 4 and above prints information on headers, 3 and above prints response codes (404, 200, etc.), 2 and above prints warnings and info.
-V
Display version number and exit.
-w
Print out results in HTML tables. Default table is two columns wide, with a white background.
-x <table>-attributes
String to use as attributes for <table> . Attributes are inserted <table here > .
-X proxy [: port ]
Use a proxy server for the requests.
-y <tr>-attributes
String to use as attributes for <tr> .
-z <td>-attributes
String to use as attributes for <td>
2 ab也可以运行在windows中，如果在windows下安装apache,就可以在bin下找到ab.exe
直接就可以使用，不用依赖其他的dll
下面是我使用ab.exe 测试新浪一个页面的结果：
C:\Users\nickyjf\Desktop\useful>ab -n1000 -c100 http://sports.sina.com.cn/k/2011-05-24/12095590365.shtml
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 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)
3 apache的ab工具也算是一种ddos攻击工具
相关推荐
ApacheBench(压力测试).很好的教程 做好人了
ApacheBench阿帕奇自带的压力测试工具
ApacheBench压力测试工具，配合使用文档使用，凑字凑字凑字
ApacheBench测试，ab.exe纯文件，省去配置apache麻烦。
apache压力测试，下载压缩包后，直接解压到目录，使用简单方便快捷
Windows下的ApacheBench。网站压力测试神器。
ApacheBench 是 Apache 服务器自带的一个web压力测试工具，简称ab。ab又是一个命令行工具，对发起负载的本机要求很低，根据ab命令可以创建很多的并发访问线程，模拟多个访问者同时对某一URL地址进行访问，因此可以...
-n 即requests，用于指定压力测试总共的执行次数。 -c 即concurrency，用于指定的并发数。 -t 即timelimit，等待响应的最大时间(单位：秒)。 -b 即windowsize，TCP发送/接收的缓冲大小(单位：字节)。 -p 即...
Apache中有个自带的，名为ab的程序，可以对Apache或其它类型的服务器进行网站访问压力测试。 ApacheBench命令原理： ab命令会创建很多的并发访问线程，模拟多个访问者同时对某一URL地址进行访问。它的测试...
apache2.2+centos6.4 64位环境下编译 用之前需要安装 apr和apr-util依赖包
ApacheBench 是 Apache 服务器自带的一个web压力测试工具，简称ab。ab又是一个命令行工具，对发起负载的本机要求很低，根据ab命令可以创建很多的并发访问线程，模拟多个访问者同时对某一URL地址进行访问，因此可以...
使用Apache Bench工具进行网站压力测试 下载我们需要的测试工具（ab）到你的电脑中apache bench工具下载地址 将下好的压缩包放在你的任意磁盘中，并解压出压缩包里的，我是解压缩到了D盘中 使用window10命令行工具...
apache bench 简称AB，是apache自己的压力测试功能，简单好用。官网上说: ab是Apache超文本传输协议(HTTP)的性能测试工具。其设计意图是描绘当前所安装的Apache的执行性能，主要是显示你安装的Apache每秒可以处理...
主要介绍了压力测试工具Apache Bench实现原理及用法解析,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
但它除了可以对apache服务器进行压力测试之外，也可以对其它类似web server进行压力测试，比如nginx、tomcat、IIS等等。 linux系统下安装过apache httpd服务后可以直接使用ab测试工具了，否则，可以到其官网下载...
主要介绍了apache ab工具页面压力测试返回结果含义解释,ab工具的使用非常简单,但返回结果中的数据有点多,看不懂的话就需要看看本文了,需要的朋友可以参考下
为了做压力测试可观察效果，就选择了ApacheBench来作为压力测试工具。其实就是大家常说的ab。 但是这个工具是安装apache web server的时候自带的，现在我服务器上都是跑nginx。也不想为了用这个工具就再装个apache。...