一、简介
ab是apache自带的压力测试工具。ab非常实用，它不仅可以对apache服务器进行网站访问压力测试，也可以对或其它类型的服务器进行压力测试。比如nginx、tomcat、IIS等。
二、语法
Usage: ab [options] [http[s]://]hostname[:port]/pathOptions are:-n requests Number of requests to perform-c concurrency Number of multiple requests tomake-t timelimit Seconds to max.waitforresponses-b windowsize Size of TCP send/receive buffer,inbytes #-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 headerforPOSTing, eg.'application/x-www-form-urlencoded'Default is'text/plain'-v verbosity How much troubleshootinginfotoPRint-wPrint out resultsinHTML tables-i Use HEAD instead of GET-x attributes String to insert as table attributes-y attributes String to insert astrattributes-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 formatfile.-e filename Output CSVfilewith 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)
三、实例
http://blog.chinaunix.net/uid-20382003-id-3032167.html
参考：http://www.jb51.net/article/59469.htm