使用ab命令对网站进行压力测试

概述

这是apache自带的一个网站压力测试工具,是ApacheBench的缩写,我们可以使用这个工具来对我们的网站进行压力测试

安装

在ubuntu上要安装下面这个包
sudo apt-get install apache2-utils
在centos下是下面这个包
sudo yum install httpd-tools -y

使用

可以直接输入ab来看参数和使用方法

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➜  ~ 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 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
-l Accept variable document length (use this for dynamic pages)
-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.
-m method Method name
-h Display usage information (this message)
-Z ciphersuite Specify SSL/TLS cipher suite (See openssl ciphers)
-f protocol Specify SSL/TLS protocol
(TLS1, TLS1.1, TLS1.2 or ALL)
➜ ~

下面介绍一个最常用的使用方法
ab -c 10 -n 100 http://www.example.com/
上面的意思是模仿10个用户对网站进行1000次请求
下面是输出

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➜  ~  ab -c 10 -n 100 http://www.linux.cn/ 
This is ApacheBench, Version 2.3 <$Revision: 1706008 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking www.linux.cn (be patient).....done


Server Software: nginx
Server Hostname: www.linux.cn
Server Port: 80

Document Path: /
Document Length: 178 bytes

Concurrency Level: 10
Time taken for tests: 0.861 seconds
Complete requests: 100
Failed requests: 0
Non-2xx responses: 100
Total transferred: 35800 bytes
HTML transferred: 17800 bytes
Requests per second: 116.09 [#/sec] (mean)
Time per request: 86.142 [ms] (mean)
Time per request: 8.614 [ms] (mean, across all concurrent requests)
Transfer rate: 40.59 [Kbytes/sec] received

Connection Times (ms)
min mean[+/-sd] median max
Connect: 32 41 7.3 37 53
Processing: 33 42 7.4 38 55
Waiting: 33 42 7.4 38 55
Total: 65 83 14.7 75 108

Percentage of the requests served within a certain time (ms)
50% 75
66% 78
75% 102
80% 103
90% 105
95% 106
98% 107
99% 108
100% 108 (longest request)

其实你最主要看的输出参数是下面这几个

  • Server Software 服务器软件
  • Server Hostname 主机名
  • Server Port 服务器端口
  • Time taken for tests 测试时间
  • Complete requests完成的请求
  • Failed requests 失败的请求
  • Time per request 每次请求的时间
  • Transfer rate 传输速度

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