ApacheBench(ab)使用简介

服务器负载太大而影响程序效率也是很常见的，Apache服务器自带有一个叫AB(ApacheBench)的工具，在bin目录下。使用这个轻巧的工具我们可以对服务器进行负载测试，

基本用法:

ab -n 全部请求数 -c 并发数 测试url

例:ab -n 1000 -c 50

得到结果类似于(后面颜色字为中文翻译):

Server Software:        Apache/2.0.55
Server Hostname:        localhost
Server Port:            80

Document Path:          /1.php
Document Length:        82522 bytes  #请求文档大小

Concurrency Level:      50           #并发数 
Time taken for tests:   92.76140 seconds #全部请求完成耗时
Complete requests:      10000          #全部请求数
Failed requests:        1974           #失败的请求
   (Connect: 0, Length: 1974, Exceptions: 0)
Write errors:           0
Total transferred:      827019400 bytes #总传输大小
HTML transferred:       825219400 bytes
Requests per second:    108.61 [#/sec] (mean) #每秒请求数(平均)
Time per request:       460.381 [ms] (mean) #每次并发请求时间(所有并发)
Time per request:       9.208 [ms] (mean, across all concurrent requests)                              #每一请求时间(并发平均)  
Transfer rate:          8771.39 [Kbytes/sec] received #传输速率

Connection Times (ms) #连接时间
              min  mean[+/-sd] median   max
Connect(#连接):        0    0   2.1      0      46
Processing(#处理):    31  458  94.7    438    1078
Waiting(#等待):       15  437  87.5    422     938
Total:         31  458  94.7    438    1078

其它参数:

 -n requests     全部请求数
 -c concurrency  并发数
 -t timelimit    最传等待回应时间
 -p postfile     POST数据文件
 -T content-type POST Content-type
 -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    加入cookie, eg. 'Apache=1234. (repeatable)
 -H attribute    加入http头, eg. 'Accept-Encoding: gzip'
                 Inserted after all normal header lines. (repeatable)
 -A attribute    http验证,分隔传递用户名及密码
 -P attribute    Add Basic Proxy Authentication, the attributes
                 are a colon separated username and password.
 -X proxy:port   代理服务器
 -V              查看ab版本
 -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
 -h              Display usage information (this message)