性能工具之ab压力测试工具及ab命令详解
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
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yum -y install httpd-tools
查看版本
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[root@7dgroup2 ~]# ab -V -
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/ -
-
帮助 -
[root@7dgroup2 ~]# ab help -
ab: invalid URL -
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 at a time -
-t timelimit Seconds to max. to spend on benchmarking -
This implies -n 50000 -
-s timeout Seconds to max. wait for each response -
Default 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 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. -
-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 ~]#
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-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。
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-c一次产生的请求个数。默认是一次一个。
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-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
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[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).....done -
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Server Software: #服务器软件 -
Server Hostname: 172.17.211.142 #域名 -
Server Port: 8089 #请求端口号 -
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Document Path: / #文件路径 -
Document Length: 76443 bytes #页面字节数 -
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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: 0 -
Total 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 -
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Connection Times (ms) -
min mean[+/-sd] median max -
Connect: 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，
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#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。
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#所以Total是从整个请求所需要的时间的角度来统计的。
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Percentage of the requests served within a certain time (ms) -
50% 42 -
66% 45 -
75% 51 -
80% 52 -
90% 60 -
95% 60 -
98% 60 -
99% 60 -
100% 60 (longest request)
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