Apache ab 使用说明
第一章 简介ab是Apache超文本传输协议(HTTP)的性能测试工具。其设计意图是描绘当前所安装的Apache的执行性能，主要是显示你安装的Apache每秒可以处理多少个请求。
第二章 说明
ab [-A auth-username ] [ -c concurrency ] [ -C cookie-name=value ] [ -d ] [ -ecsv-file ] [ -g gnuplot-file ] [ -h ] [ -H custom-header ] [ -i ] [ -k ] [ -nrequests ] [ -p POST-file ] [ -P proxy-auth-username] [ -q ] [ -s ] [ -S ] [-t timelimit ] [ -T content-type ] [ -v verbosity] [ -V ] [ -w ] [ -x<table>-attributes ] [ -X proxy[] ] [ -y <tr>-attributes ] [ -z<td>-attributes ] hostname[:port]/path
第三章 用法
用法：ab -n全部请求数 -c并发数测试url
实例：
E:\ab\ab.exe -c 100 -n 1000 http://192.168.1.123/exam/
第四章 测试结果
This is ApacheBench, Version 2.0.41-dev<$Revision: 1.121.2.12 $> apache-2.0
Copyright (c) 1996 Adam Twiss, ZeusTechnology Ltd, http://www.zeustech.net/
Copyright (c) 1998-2002 The Apache SoftwareFoundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Finished 1000 requests
Server Software: Apache/2.0.54 //平台apache 版本2.0.54
Server Hostname: 127.0.0.1//服务器主机名
Server Port: 80 //服务器端口
Document Path: /index.html.zh-cn.gb2312 //测试的页面文档
Document Length: 1018 bytes//文档大小
Concurrency Level: 1000//并发数
Time taken for tests: 8.188731 seconds //整个测试持续的时间
Complete requests: 1000 //完成的请求数量
Failed requests: 0 //失败的请求数量
Write errors: 0
Total transferred: 1361581 bytes //整个场景中的网络传输量
HTML transferred: 1055666 bytes //整个场景中的HTML内容传输量
Requests per second: 122.12 [#/sec] (mean) //每秒事务数
Time per request: 8188.731 (mean) //平均事务响应时间
//每个请求实际运行时间的平均值
Time per request: 8.189 (mean, acrossall concurrent requests)
//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
Transfer rate: 162.30 received
//网络上消耗的时间的分解，各项数据的具体算法还不是很清楚
Connection Times (ms)
min mean[+/-sd] median max
Connect: 4 646 1078.7 893291
Processing: 165 992 493.1 9384712
Waiting: 118 934 480.6 8824554
Total: 813 1638 1338.9 10937785
//整个场景中所有请求的响应情况。在场景中每个请求都有一个响应时间，其中50％的用户响应时间小于1093 毫秒，60％的用户响应时间小于1247 毫秒，最大的响应时间小于7785 毫秒
Percentage of the requests served within acertain time (ms)
50%1093
66%1247
75%1373
80%1493
90%4061
95%4398
98%5608
99%7368
100%7785 (longest request)
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