1.安裝ab命令
sudo apt-get install apache2-utils2.ab命令参数说明
Usage: ab [options] [http[s]://]hostname[:port]/pathOptions are://总的请求数 -n requests Number of requests to perform宅 //一次同时并发的请求数 总的请求数(n)=次数*一次并发数(c) -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 attributesare a colon separated username and password.-P attribute Add Basic Proxy Authentication, the attributesare 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)3.运行 ab -n 100 -c 10 http://www.meetu.hk/ 对 http://www.meetu.hk/ 进行100次请求，10个并发请求压力测试结果。
Server Software: lighttpd/1.4.20Server Hostname: www.meetu.hkServer Port: 80Document Path: /Document Length: 2095 bytesConcurrency Level: 10//整个测试持续的时间 Time taken for tests: 3.303 seconds//完成的请求数量 Complete requests: 100Failed requests: 0Write errors: 0Total transferred: 235200 bytesHTML transferred: 209500 bytes//平均每秒处理30个请求 Requests per second: 30.27 [#/sec] (mean)//平均每个请求处理时间为330毫秒 注:这里将一次10个并发请求看成一个整体 Time per request: 330.335 [ms] (mean)//平均每个并发请求处理 时间 为33毫秒 Time per request: 33.034 [ms] (mean, across all concurrent requests)Transfer rate: 69.53 [Kbytes/sec] receivedConnection Times (ms)min mean[+/-sd] median maxConnect: 51 170 35.9 178 230Processing: 60 153 64.5 121 263Waiting: 55 148 64.4 115 258Total: 235 322 59.9 299 437Percentage of the requests served within a certain time (ms)//在这100个请求中有50%在299毫秒内完成 50% 299//在这100个请求中有66%在312毫秒内完成 66% 31275% 38380% 41290% 43195% 43298% 43699% 437100% 437 (longest request)