webbench最多可以模拟3万个并发连接去测试网站的负载能力，个人感觉要比Apache自带的ab压力测试工具好，安装使用也特别方便。
1、适用系统：Linux
2、编译安装：
引用
wget http://blog.zyan.cc/soft/linux/webbench/webbench-1.5.tar.gz
tar zxvf webbench-1.5.tar.gz
cd webbench-1.5
make && make install
3、使用：
引用
webbench -c 500 -t 30 http://127.0.0.1/test.jpg
参数说明：-c表示并发数，-t表示时间(秒)
4、测试结果示例：
引用
Webbench - Simple Web Benchmark 1.5
Copyright (c) Radim Kolar 1997-2004, GPL Open Source Software.
Benchmarking: GET http://127.0.0.1/test.jpg
500 clients, running 30 sec.
Speed=3230 pages/min, 11614212 bytes/sec.
Requests: 1615 susceed, 0 failed.
http://zyan.cc/post/288/
报错1：
出现下列异常：
/usr/bin/install -c -m 644 jconfig.h /usr/local/jpeg6/include/jconfig.h
/usr/bin/install: cannot create regular file `/usr/local/jpeg6/include/jconfig.h': No such file or directory
make: *** [install-headers] Error 1
原来要创建对应的目录，命令如下：
mkdir -p /usr/local/jpeg6/bin
mkdir /usr/local/jpeg6/lib
mkdir /usr/local/jpeg6/inculde
mkdir /usr/local/jpeg6/man
mkdir /usr/local/jpeg6/man/man1
继续安装原来的方式安装就OK啦
报错2：
make && make install
ctags *.c
/bin/sh: ctags: command not found
make: [tags] Error 127 (ignored)
install -s webbench /usr/local/bin
install -m 644 webbench.1 /usr/local/man/man1
install -d /usr/local/share/doc/webbench
install -m 644 debian/copyright /usr/local/share/doc/webbench
install -m 644 debian/changelog /usr/local/share/doc/webbench
解决办法：
yum install ctags
http://blog.csdn.net/xanxng/article/details/7588133