一、安装：
yum -y install httpd-tools
二、命令
# 每次同时发送100个请求，总共1000个请求
ab -n 1000 -c 100
# ab -k -c 100 -n 10000 http://127.0.0.1:9501/ 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) Completed 1000 requests Completed 2000 requests Completed 3000 requests Completed 4000 requests Completed 5000 requests Completed 6000 requests Completed 7000 requests Completed 8000 requests Completed 9000 requests Completed 10000 requests Finished 10000 requests Server Software: Hyperf Server Hostname: 127.0.0.1 Server Port: 9501 Document Path: / Document Length: 42 bytes Concurrency Level: 100 Time taken for tests: 0.624 seconds Complete requests: 10000 Failed requests: 0 Write errors: 0 Keep-Alive requests: 10000 Total transferred: 1900000 bytes HTML transferred: 420000 bytes Requests per second: 16020.94 [#/sec] (mean) Time per request: 6.242 [ms] (mean) Time per request: 0.062 [ms] (mean, across all concurrent requests) Transfer rate: 2972.64 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median max Connect: 0 1 7.0 0 104 Processing: 0 5 4.0 4 108 Waiting: 0 5 3.8 4 37 Total: 0 6 8.4 4 127 Percentage of the requests served within a certain time (ms) 50% 4 66% 5 75% 6 80% 6 90% 10 95% 14 98% 20 99% 24 100% 127 (longest request)
Server Software: 对方服务器网络软件和版本 比如nginx/1.8.1
Document Path:请求目录
Document Length:请求文件大小
Concurrency Level:并发量
Time taken for tests:总共花费时间
Complete requests:总共请求次数
Failed requests:请求失败次数
Total transferred:总共数据量
HTML transferred:总共html代码量
Requests per second:每秒完成的请求书 ----非常重要
参考：https://blog.csdn.net/feiwutudou/article/details/80334099