ab压力测试

ab的安装

1.源码安装apache

apache安装完毕后ab命令存放在apache安装目录的bin目录下。

2.yum安装apache

若是apache 是经过yum的RPM包方式安装的话，ab命令默认存放在/usr/bin目录下

3.没有安装apache直接安装ab

若是不想安装apache可是又想使用ab命令的话，咱们能够直接安装apache的工具包httpd-tools

yum -y install httpd-tools

 

ab的使用

-c 表示 并发用户数

-n表示 总请求数

[root@cobbler bin]# ab -c3 -n30 https://10.207.200.100/main/index/index
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 10.207.200.100 (be patient).....done


Server Software:        Apache/2.2.15
Server Hostname:        10.207.200.100
Server Port:            443
SSL/TLS Protocol:       TLSv1/SSLv3,ECDHE-RSA-AES256-GCM-SHA384,2048,256

Document Path:          /main/index/index
Document Length:        295 bytes

Concurrency Level:      3
Time taken for tests:   0.232 seconds
Complete requests:      30
Failed requests:        0
Write errors:           0
Non-2xx responses:      30
Total transferred:      14250 bytes
HTML transferred:       8850 bytes

Requests per second:    129.59 [#/sec] (mean)
Time per request:       23.150 [ms] (mean)
Time per request:       7.717 [ms] (mean, across all concurrent requests)
Transfer rate:          60.11 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:       12   19   7.6     16      42
Processing:     0    2   2.4      1      10
Waiting:        0    1   1.0      1       5
Total:         12   21   8.9     17      52

Percentage of the requests served within a certain time (ms)
  50%     17                   #50%的请求在17S完成
  66%     21                   #66%的请求在21S完成
  75%     22
  80%     27
  90%     34
  95%     36
  98%     52
  99%     52
 100%     52 (longest request)

 

（1）Requests per second吞吐率

服务器并发处理能力的量化描述，单位是reqs/s，指的是在某个并发用户数下单位时间内处理的请求数。某个并发用户数下单位时间内能处理的最大请求数，称之为最大吞吐率。

计算公式：Complete requests/Time taken for tests

（2）Time per request用户平均请求等待时间

计算公式：Time token for tests/（Complete requests/Concurrency Level）。

（3）Time per requet(across all concurrent request)服务器平均请求等待时间

计算公式：Time taken for tests/Complete requests，正好是吞吐率的倒数。