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在 apache 本身的套件中, 有個叫 ab(ApacheBench) 的程式.
ApacheBench 主要是用來測試 apache 執行效率.

ab 參數:
Usage: /usr/sbin/ab [options] [http[s]://]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
-p postfile File containg data to POST
-T content-type Content-type header for POSTing
-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: zop'
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
-s Use httpS instead of HTTP (SSL)
-h Display usage information (this message)

ex: 要執行 1000 次的 connection, 20 次的 concurrent (並行, 同時).
語法: ab -n 1000 -c 20 http://localhost/abc.php
產生出來的結果. 主要要注意的是以下幾個.
Time taken for tests: 總共執行花了多久的時間.(以上 1000 次共多久)
Requests per second: 每秒平均可以處理多少個 connection.

源自：http://blog.longwin.com.tw/archives/000513.html