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Apache 壓力測試

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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.
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