apache ab.exe性能测试简单运用

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，能够同时模拟多个并发请求。前段时间看到公司的研发人员也在用他作一些测试，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，相信大家能够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:\Apache2.2\bin>ab -n 10 -c 10 http://www.google.com/
This is ApacheBench, Version 2.0.40-dev  apache-2.0
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright 1997-2005 TheApacheSoftware 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，能够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任何请求的响应情况。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，但是他足够轻便，假如只是在研发过程中想检查一下某个模块的响应情况，或做一些场景比较简单的测试，ab 还是个不错的选择——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 的周详参数解释，大家有兴趣的能够研究一下。

ab [ -Aauth-username:password ] [ -cconcurrency ] [ -Ccookie-name=value ] [ -d ] [ -ecsv-file ] [ -ggnuplot-file ] [ -h ] [ -Hcustom-header ] [ -i ] [ -k ] [ -nrequests ] [ -pPOST-file ] [ -Pproxy-auth-username:password ] [ -q ] [ -s ] [ -S ] [ -ttimelimit ] [ -Tcontent-type ] [ -vverbosity] [ -V ] [ -w ] [ -x-attributes ] [ -Xproxy[:port] ] [ -y-attributes ] [ -z-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