安装工具
# yum -y install httpd-tools
语法: ab -n 数字 -c 数字 http://链接
-n requests Number of requests to perform
#在测试会话中所执行的请求总个数。
-c concurrency Number of multiple requests to make
#一次产生的请求个数。
# ab -n 100 -c 100 http://www.alexorz.com/index.htmlThis 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 www.alexorz.com (be patient).....done Server Software: nginxServer Hostname: www.alexorz.comServer Port: 80 Document Path: /index.htmlDocument Length: 102 bytes Concurrency Level: 100Time taken for tests: 4.002 secondsComplete requests: 100Failed requests: 0Write errors: 0Non-2xx responses: 100Total transferred: 61600 bytesHTML transferred: 10200 bytesRequests per second: 24.99 [#/sec] (mean)Time per request: 4002.247 [ms] (mean)Time per request: 40.022 [ms] (mean, across all concurrent requests)Transfer rate: 15.03 [Kbytes/sec] received Connection Times (ms) min mean[+/-sd] median maxConnect: 11 38 10.2 40 58Processing: 53 1979 1113.6 1985 3886Waiting: 48 1978 1113.7 1984 3886Total: 64 2017 1123.5 2025 3939 Percentage of the requests served within a certain time (ms) 50% 2025 66% 2628 75% 3003 80% 3218 90% 3584 95% 3784 98% 3884 99% 3939 100% 3939 (longest request)
吞吐率(Requests per second) 概念:服务器并发处理能力的量化描述,单位是reqs/s,指的是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:总请求数 / 处理完成这些请求数所花费的时间,即 Request per second = Complete requests / Time taken for tests
并发连接数(The number of concurrent connections) 概念:某个时刻服务器所接受的请求数目,简单的讲,就是一个会话。
并发用户数(The number of concurrent users,Concurrency Level) 概念:要注意区分这个概念和并发连接数之间的区别,一个用户可能同时会产生多个会话,也即连接数。
用户平均请求等待时间(Time per request) 计算公式:处理完成所有请求数所花费的时间/ (总请求数 / 并发用户数),即 Time per request = Time taken for tests /( Complete requests / Concurrency Level)
服务器平均请求等待时间(Time per request: across all concurrent requests) 计算公式:处理完成所有请求数所花费的时间 / 总请求数,即 Time taken for / testsComplete requests 可以看到,它是吞吐率的倒数。 同时,它也=用户平均请求等待时间/并发用户数,即 Time per request / Concurrency Level