背景
ab小型压力工具，对于在Linux中简单调试还是比较方便，轻巧灵活.
安装
yum -y install httpd-tools
查看版本
[root@7dgroup2 ~]# ab -VThis is ApacheBench, Version 2.3 <$Revision: 1430300 $>Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/帮助[root@7dgroup2 ~]# ab helpab: invalid URLUsage: ab [options] [http[s]://]hostname[:port]/pathOptions are:-n requests Number of requests to perform-c concurrency Number of multiple requests to make at a time-t timelimit Seconds to max. to spend on benchmarkingThis implies -n 50000-s timeout Seconds to max. wait for each responseDefault is 30 seconds-b windowsize Size of TCP send/receive buffer, in bytes-B address Address to bind to when making outgoing connections-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 to use for POST/PUT data, 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.-q Do not show progress when doing more than 150 requests-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(SSL3, TLS1, TLS1.1, TLS1.2 or ALL)[root@7dgroup2 ~]#
- -n在测试会话中所执行的请求个数。默认时，仅执行一个请求。
- -c一次产生的请求个数。默认是一次一个。
- -t测试所进行的最大秒数。其内部隐含值是-n 50000，它可以使对服务器的测试限制在一个固定的总时间以内。默认时，没有时间限制。
快速上手
[root@7dgroup2 ~]# ab -n10 -c 10 http://172.17.211.142:8089/This is ApacheBench, Version 2.3 <$Revision: 1430300 $>Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/Licensed to The Apache Software Foundation, http://www.apache.org/Benchmarking 172.17.211.142 (be patient).....doneServer Software: #服务器软件Server Hostname: 172.17.211.142 #域名Server Port: 8089 #请求端口号Document Path: / #文件路径Document Length: 76443 bytes #页面字节数Concurrency Level: 10 #请求的并发数Time taken for tests: 0.064 seconds #总访问时间Complete requests: 10 #请求成功数量Failed requests: 0 #请求失败数量Write errors: 0Total transferred: 766030 bytes #请求总数据大小（包括header头信息）HTML transferred: 764430 bytes #html页面实际总字节数Requests per second: 157.09 [#/sec] (mean) #每秒多少请求,服务器的吞吐量Time per request: 63.656 [ms] (mean) #用户平均请求等待时间Time per request: 6.366 [ms] (mean, across all concurrent requests) # 服务器平均处理时间，也就是服务器吞吐量的倒数Transfer rate: 11751.86 [Kbytes/sec] received #每秒获取的数据长度Connection Times (ms)min mean[+/-sd] median maxConnect: 0 0 0.0 0 0 #网络链接Processing: 8 36 17.1 41 60 #系统处理Waiting: 3 24 18.7 18 55 #等待Total: 9 37 17.1 42 60- #Total并不等于前三行数据相加，因为前三行的数据并不是在同一个请求中采集到的，
- #可能某个请求的网络延迟最短，但是系统处理时间又是最长的呢。
- #所以Total是从整个请求所需要的时间的角度来统计的。
Percentage of the requests served within a certain time (ms)50% 4266% 4575% 5180% 5290% 6095% 6098% 6099% 60100% 60 (longest request)
