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• 安装ab压力测试工具

yum install httpd-tools

• ab命令使用格式及其常用的参数

ab -n 50 -c 20 http://192.168.15.7/download/-n : 总的请求数-c : 同时并发的请求数

• 压力测试工具输出内容详解

[root@web02 ~]  ab -n 50 -c 20 http://192.168.15.7/download/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 192.168.15.7 (be patient).....doneServer Software:        nginx/1.20.0Server Hostname:        192.168.15.7Server Port:            80Document Path:          /download/Document Length:        453 bytesConcurrency Level:      20Time taken for tests:   0.006 seconds				发费的总时间Complete requests:      50							总共发起的请求个数Failed requests:        44							没有来得及处理的请求个数   (Connect: 0, Receive: 0, Length: 44, Exceptions: 0)Write errors:           0Non-2xx responses:      44Total transferred:      19052 bytesHTML transferred:       10330 bytesRequests per second:    8434.55 [#/sec] (mean)				每秒请求数（总请求数除总时间）Time per request:       2.371 [ms] (mean)					对于客户端而言，单个请求所用的时间Time per request:       0.119 [ms] (mean, across all concurrent requests)		服务端处理请求的时间，不包括网络传输时间等Transfer rate:          3138.57 [Kbytes/sec] received				网络速率，可以用来当作网络瓶颈参考值Connection Times (ms)              min  mean[+/-sd] median   maxConnect:        0    0   0.1      0       1Processing:     1    1   0.5      1       2Waiting:        0    1   0.3      1       2Total:          1    2   0.4      2       2Percentage of the requests served within a certain time (ms)  50%      2  66%      2  75%      2  80%      2  90%      2  95%      2  98%      2  99%      2 100%      2 (longest request)