最近app需要搭建后台，故此研究一下，靠谱的后台服务器..网传nginx 能达到的并发数量比apache 高. LAMP or LNMP ？ 根据需求测试结果来进行选择。
首先是安装LNMP测试完后 再测试 LAMP，网上很多，我这里就介绍一下自己在ubuntu 安装webbench(压力测试工具)http://home.tiscali.cz/~cz210552/webbench.html
1.下载webbench
miechal@miechal-ubuntu:~$ wget http://home.tiscali.cz/~cz210552/distfiles/webbench-1.5.tar.gz
2.解压安装webbench
miechal@miechal-ubuntu:~/Downloads$ tar -zxvf webbench-1.5.tar.gz
miechal@miechal-ubuntu:~/Downloads$ cd webbench-1.5/
miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ make && make install
可能会遇到权限问题和ctags命令解析不了问题：
make: [tags] Error 127 (ignored)
install -s webbench /usr/local/bin
install: cannot create regular file `/usr/local/bin/webbench': Permission denied
解决方法：
（1）.修改相应目录的权限
miechal@miechal-ubuntu:/usr$ sudo chmod a+w -R local/
(2) 安装 ctags命令
miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ sudo apt-get install ctags
(3)安装make
miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ sudo make && make install
3.接下来可以测试了
条件1：模拟200个客户端请求.
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miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ webbench -c 200 -t 60 http://127.0.0.1/index.php （-c 时间同时并发连接数，-t是请求持续的时间）
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1/index.php
200 clients, running 60 sec.
Speed=61325 pages/min, 164563 bytes/sec.
Requests: 61325 susceed, 0 failed.
结果1：服务器响应 1022 page /sec,61325请求全部成功
请求2： 500 个客户端并发请求，流畅
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miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ webbench -c 500 -t 60 http://127.0.0.1/index.phpWebbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1/index.php
500 clients, running 60 sec.
Speed=48949 pages/min, 133143 bytes/sec.
Requests: 48949 susceed, 0 failed.
结果2：48949 pages/min, 133143 bytes/sec ，响应顺利
请求3:1000个客户端并发请求
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miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ webbench -c 1000 -t 60 http://127.0.0.1/index.php
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1/index.php
1000 clients, running 60 sec.
Speed=18342 pages/min, 52711 bytes/sec.
Requests: 18309 susceed, 33 failed.
结果3：响应延迟，并有失败现象
请求4:2000个客户端并发请求
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miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ webbench -c 2000 -t 60 http://127.0.0.1/index.php
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1/index.php
2000 clients, running 60 sec.
Speed=585724 pages/min, 125593 bytes/sec.
Requests: 584688 susceed, 1036 failed.
结果4：失败数增多
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请求5:10000个客户端并发请求
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miechal@miechal-ubuntu:~/Downloads/webbench-1.5$ webbench -c 10000 -t 60 http://127.0.0.1/index.php
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1/index.php
10000 clients, running 60 sec.
problems forking worker no. 7762
fork failed.: Resource temporarily unavailable
结果5：服务器挂了
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