在阿帕奇伺服器的套件中,有一個叫 做ab(ApacheBench)的工具。ApacheBench主要是用來測試阿帕奇伺服器執行效率用的
ApacheBench 可以針對某個特定的 URL 仿真出連續的聯機請求,同時還可以仿真出同時間點數個相同的聯機請求,是以利用 ApacheBench 可幫助我們在網站開發期間仿真實際上線可能的情況,利用仿真出來的資料做為調整伺服器設定或程式的依據。 ApacheBench 的用法如下:
Usage: /usr/local/apache/bin/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 -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
-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 -V Print version number and exit -k Use HTTP KeepAlive feature
-h Display usage information (this message)
假設我們要對 echo.fcg 做測試,仿真 1000 次的聯機請求,而且同一時間有 20 個并行的 (concurrent) 聯機請求的情況,隻要在指令列模式下執行
$ ab -n 1000 -c 20 http://localhost/fcgi-bin/echo.fcg
之後ab工作後會把結果顯示出來
This is ApacheBench, Version 1.3
Copyright c 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Copyright c 1998-1999 The Apache Group, http://www.apache.org/
Benchmarking localhost (be patient)... Server Software: Apache/1.3.6
Server Hostname: localhost
Server Port: 80
Document Path: /fcgi-bin/echo.fcg
Document Length: 995 bytes
Concurrency Level: 20
Time taken for tests: 6.859 seconds
Complete requests: 1000
Failed requests: 0
Total transferred: 1142000 bytes
HTML transferred: 995000 bytes
Requests per second: 145.79
Transfer rate: 166.50 kb/s received
Connnection Times (ms)
min avg max
Connect: 0 4 61
Processing: 62 128 771
Total: 62 132 832
以上結果指出,在同時間20 個聯機請求 (Concurrency Level) 的情況下,完成 1000 次的聯機請求,共花了 6.859 秒(Time taken for tests),是以這個程式每秒平均可以處理(Requests per second) 145.79