[研究] ApacheBench 2.3 (CentOS 6.4 x64)

[研究] ApacheBench 2.3 (CentOS 6.4 x64)

ApacheBench (ab) 是 Apache HTTP server benchmarking tool

CentOS 6.4 預設好像會安裝它，可以用下面方法查出是 httpd-tools 套件中的工具

[root@localhost ~]# rpm -q --whatprovides /usr/bin/ab httpd-tools-2.2.15-26.el6.centos.x86_64

安裝最新版 ApacheBench

[root@localhost ~]# yum -y install  httpd-tools

執行 ab，可以看出提供的參數，最常用的該是 -n 和 -c

[root@localhost ~]# ab ab: wrong number of arguments Usage: 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     -b windowsize   Size of TCP send/receive buffer, in bytes     -p postfile     File containing data to POST. Remember also to set -T     -u putfile      File containing data to PUT. Remember also to set -T     -T content-type Content-type header for POSTing, eg.                     'application/x-www-form-urlencoded'                     Default is 'text/plain'     -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: gzip'                     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     -r              Don't exit on socket receive errors.     -h              Display usage information (this message)     -Z ciphersuite  Specify SSL/TLS cipher suite (See openssl ciphers)     -f protocol     Specify SSL/TLS protocol (SSL2, SSL3, TLS1, or ALL) [root@localhost ~]#

檢查版本

[root@localhost ~]# ab -V 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/

先簡單測試一下，送出 200 個要求，同一時間最多 100 要求同時出現
(可以想成某段時間共 200 人次瀏覽，同一時間最多 100 人同時瀏覽；所以 n 不可小於 c )

注意：這台網站是另外架設的測試機器，不要拿公開的網站當白老鼠

[root@localhost ~]# ab -n 200 -c 100 http://forum2.icst.org.tw/phpbb/index.php 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 forum2.icst.org.tw (be patient) Completed 100 requests Completed 200 requests Finished 200 requests Server Software:        Apache/2.2.15 Server Hostname:        forum2.icst.org.tw Server Port:            80 Document Path:          /phpbb/index.php Document Length:        84222 bytes Concurrency Level:      100 Time taken for tests:   6.291 seconds Complete requests:      200 Failed requests:        0 Write errors:           0 Total transferred:      16968400 bytes HTML transferred:       16844400 bytes Requests per second:    31.79 [#/sec] (mean) Time per request:       3145.380 [ms] (mean) Time per request:       31.454 [ms] (mean, across all concurrent requests) Transfer rate:          2634.13 [Kbytes/sec] received Connection Times (ms)               min  mean[+/-sd] median   max Connect:        0    7   5.0      9      13 Processing:   587 2583 934.7   2983    3968 Waiting:      577 2560 932.8   2949    3815 Total:        600 2590 930.9   2986    3968 Percentage of the requests served within a certain time (ms)   50%   2986   66%   3232   75%   3303   80%   3382   90%   3458   95%   3519   98%   3612   99%   3689  100%   3968 (longest request) [root@localhost ~]#

接下來測試 (建議 n 比 c 大個10倍或更多，若 -n 100 -c 100，雖然 -c 100 設定同時最多 100 個要求同時送出，但實際上不太可能發生)
ab -n 1000 -c 100 http://forum2.icst.org.tw/phpbb/index.php
ab -n 1000 -c 200 http://forum2.icst.org.tw/phpbb/index.php
ab -n 1000 -c 300 http://forum2.icst.org.tw/phpbb/index.php
都順利跑完

[root@localhost ~]# ab -n 1000 -c 400 http://forum2.icst.org.tw/phpbb/index.php 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 forum2.icst.org.tw (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests Completed 500 requests Completed 600 requests Completed 700 requests apr_socket_recv: Connection refused (111) Total of 758 requests completed

順利跑完的只有 758 個 request，再跑一次

[root@localhost ~]# ab -n 1000 -c 400 http://forum2.icst.org.tw/phpbb/index.php 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 forum2.icst.org.tw (be patient) Completed 100 requests Completed 200 requests Completed 300 requests Completed 400 requests apr_socket_recv: Connection reset by peer (104) Total of 481 requests completed [root@localhost ~]#

情況相同，也就是大約最多可以承受約 300 ~ 400 人同時上線 (因為測試機只是台 VM)

要找精確的 Break Point (BreakPoint) 值，可用二分法測試
測試 -n 1000 -c 350，如果順利，增加 -c 值，取 (350+400)/2 = 375 測試；
不順利則降低 -c 值，取 (300+350)/2 = 325 測試；

因為每次測試結果不同，相同 -c 值應該多測試幾次，且 Break Point 應該無法精確到個位數，甚至十位數也不敢保證

(完)