linux下压力测试工具ab的使用

一、安装

[root@node2 logs]# yum install httpd-tools
已加载插件：fastestmirror
Loading mirror speeds from cached hostfile
 * base: mirrors.aliyun.com
 * extras: mirrors.aliyun.com
 * updates: mirrors.aliyun.com
正在解决依赖关系
--> 正在检查事务
---> 软件包 httpd-tools.x86_64.0.2.4.6-88.el7.centos 将被 安装
--> 解决依赖关系完成

依赖关系解决

===============================================================================================
 Package                架构              版本                           源               大小
===============================================================================================
正在安装:
 httpd-tools            x86_64            2.4.6-88.el7.centos            base             90 k

事务概要
===============================================================================================
安装  1 软件包

总下载量：90 k
安装大小：169 k
Is this ok [y/d/N]: y
Downloading packages:
httpd-tools-2.4.6-88.el7.centos.x86_64.rpm                              |  90 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  正在安装    : httpd-tools-2.4.6-88.el7.centos.x86_64                                     1/1 
  验证中      : httpd-tools-2.4.6-88.el7.centos.x86_64                                     1/1 

已安装:
  httpd-tools.x86_64 0:2.4.6-88.el7.centos                                                     

完毕！

二、使用

参数说明:

-n :请求总次数

-c:并发数

-k:是否开启长连接

-s:超时设置

例子：请求127.0.0.1,100次，并发10个

[root@node2 logs]# ab -n 100 -c 10 http://127.0.0.1/
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 127.0.0.1 (be patient).....done


Server Software:        nginx/1.14.2
Server Hostname:        127.0.0.1
Server Port:            80

Document Path:          /
Document Length:        612 bytes

Concurrency Level:      10
Time taken for tests:   0.008 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      84500 bytes
HTML transferred:       61200 bytes
Requests per second:    12653.42 [#/sec] (mean)
Time per request:       0.790 [ms] (mean)
Time per request:       0.079 [ms] (mean, across all concurrent requests)
Transfer rate:          10441.55 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.1      0       0
Processing:     0    1   0.1      1       1
Waiting:        0    1   0.1      1       1
Total:          0    1   0.1      1       1

Percentage of the requests served within a certain time (ms)
  50%      1
  66%      1
  75%      1
  80%      1
  90%      1
  95%      1
  98%      1
  99%      1
 100%      1 (longest request)

以上输出结果中

Concurrency Level:      10  并发数

Time taken for tests:   0.008 seconds 总耗时

Complete requests:      100  成功请求数

Failed requests:        0 失败请求数

Requests per second:    12653.42 [#/sec] (mean) 即每秒的响应请求数，也即是最大吞吐能力（qps）总请求数/总耗时

Time per request:       0.790 [ms] (mean) 客户端发出请求到收到响应，单个请求所耗费的时间

Time per request:       0.079 [ms] (mean, across all concurrent requests) 表示服务端处理单个请求所耗费的时间

 那么 0.790-0.079=0.711ms ，表示单个请求在网络传输中所耗费的时间，也就是说：客户端发出请求到收到响应的耗时=网络传输所耗费的时间+服务端处理请求所耗费的时间

Transfer rate:          10441.55 [Kbytes/sec] received ：传输速率，当前为10M，可作为网络环境测试的重要参考