AB压力测试工具

1.安装AB工具：

yum install httpd-tools

2.测试：

ab -n  -c  http://localhost.com/

其中－n表示请求数，－c表示并发数

3.测试结果

[root@vijay01 ~]# ab -c  -n  http://192.168.2.11/ab.html
This is ApacheBench, Version 2.3 <$Revision:  $>
Copyright  Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.2.11 (be patient)
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Finished  requests

Server Software:        nginx/1.0.
Server Hostname:        192.168.2.11
Server Port:            

Document Path:          /ab.html
Document Length:         bytes

Concurrency Level:
Time taken for tests:   0.105 seconds
Complete requests:
Failed requests:
Write errors:
Total transferred:       bytes
HTML transferred:        bytes
Requests per second:    9515.20 [#/sec] (mean)
Time per request:       1.051 [ms] (mean)
Time per request:       0.105 [ms] (mean, across all concurrent requests)
Transfer rate:          36332.46 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:               0.2
Processing:            0.5
Waiting:               0.4
Total:                 0.5             

Percentage of the requests served within a certain time (ms)
  %
  %
  %
  %
  %
  %
  %
  %
 %       (longest request)

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Server Software:        nginx/1.0.
Server Hostname:        192.168.2.11
Server Port:            

• 这段展示的是web服务器的信息，可以看到服务器采用的是nginx，域名是wan.bigertech.com，端口是80

Document Path:          /ab.html
Document Length:         bytes

• 这段是关于请求的文档的相关信息，所在位置“/”，文档的大小为338436 bytes（此为http响应的正文长度）

------------------------------------------------------------------------------------------------------------------

Concurrency Level:
Time taken for tests:   0.105 seconds
Complete requests:
Failed requests:
Write errors:
Total transferred:       bytes
HTML transferred:        bytes
Requests per second:    9515.20 [#/sec] (mean)
Time per request:       1.051 [ms] (mean)
Time per request:       0.105 [ms] (mean, across all concurrent requests)
Transfer rate:          36332.46 [Kbytes/sec] received

• 这段展示了压力测试的几个重要指标

　　Concurrency Level: 100　　　　　　　　 　 --并发请求数
　　Time taken for tests: 50.872 seconds　 　--整个测试持续的时间
　　Complete requests: 1000　　　　　　　  　--完成的请求数
　　Failed requests: 0 　　　　　　　　　　      --失败的请求数

　　Total transferred: 13701482 bytes　　　   --整个场景中的网络传输量
　　HTML transferred: 13197000 bytes　　　  --整个场景中的HTML内容传输量

Requests per second: 19.66 [#/sec] (mean)     --吞吐率，大家最关心的指标之一，相当于 LR 中的每秒事务数，后面括号中的 mean 表示这是一个平均值
Time per request: 5087.180 [ms] (mean)          --用户平均请求等待时间，大家最关心的指标之二，相当于 LR 中的平均事务响应时间，后面括号中的 mean 表示这是一个平均值
Time per request: 50.872 [ms] (mean, across all concurrent requests)    --服务器平均请求处理时间，大家最关心的指标之三

Transfer rate: 263.02 [Kbytes/sec] received             --平均每秒网络上的流量，可以帮助排除是否存在网络流量过大导致响应时间延长的问题

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Connection Times (ms) min  mean[+/-sd] median   max
Connect:                      0.2
Processing:  　　　　          0.5
Waiting:      　　　　         0.4
Total:       　　　　          0.5             

• 这段表示网络上消耗的时间的分解

------------------------------------------------------------------------------------------------------

Percentage of the requests served within a certain time (ms)
  50%      1
  66%      1
  75%      1
  80%      1
  90%      2
  95%      2
  98%      2
  99%      3
 100%      5 (longest request)

　　

• 这段是每个请求处理时间的分布情况，50%的处理时间在4930ms内，66%的处理时间在5008ms内...，重要的是看90%的处理时间。