安装Apache Benchmark(AB)和使用

windows

https://www.apachelounge.com/download/

CentOS下Yum直接安装：

yum install httpd-tools

Ubuntu下也差不多：

apt-get install apache2-utils

-n参数用来设置模拟请求的总次数
-c参数用来设置模拟请求的并发数
-t参数用来设置模拟请求的时间

ab -n 10000 -c 500 -t 10 http://192.168.0.91:9999/index.nginx-debian.html

Server Software:        nginx/1.10.2 (服务器软件名称及版本信息)
Server Hostname:        192.168.1.106(服务器主机名)
Server Port:            80 (服务器端口)
Document Path:          /index1.html. (供测试的URL路径)
Document Length:        3721 bytes (供测试的URL返回的文档大小)
Concurrency Level:      1000 (并发数)
Time taken for tests:   2.327 seconds (压力测试消耗的总时间)
Complete requests:      5000 (的总次数)
Failed requests:        688 (失败的请求数)
Write errors:           0 (网络连接写入错误数)
Total transferred:      17402975 bytes (传输的总数据量)
HTML transferred:       16275725 bytes (HTML文档的总数据量)
Requests per second:    2148.98 [#/sec] (mean) (平均每秒的请求数) 这个是非常重要的参数数值，服务器的吞吐量 
Time per request:       465.338 [ms] (mean) (所有并发用户(这里是1000)都请求一次的平均时间)
Time  request:       0.247 [ms] (mean, across all concurrent requests) (单个用户请求一次的平均时间)
Transfer rate:          7304.41 [Kbytes/sec] received 每秒获取的数据长度 (传输速率，单位：KB/s)
...
Percentage of the requests served within a certain time (ms)
  50%    347  ## 50%的请求在347ms内返回 
  66%    401  ## 60%的请求在401ms内返回 
  75%    431
  80%    516
  90%    600
  95%    846
  98%   1571
  99%   1593
 100%   1619 (longest request)