ab压力测试默认2万并发，突破2万并发测试。

下载：apache
http://httpd.apache.org/download.cgi

安装apache需要安装组件APR and APR-Util包、PCRE包
下载：APR and APR-Util
http://apr.apache.org/download.cgi

下载：PCRE
http://www.pcre.org/

下载后上传服务器
1、安装组件
加压
tar -zxvf apr-1.6.5.tar.gz
cd apr-1.6.5
./configure --prefix=/usr/local/apr
make && make install

tar -zxvf apr-util-1.6.1.tar.gz
cd apr-util-1.6.1
./configure --prefix=/usr/local/apr-util --with-apr=/usr/local/apr
make && make install

tar -zxvf pcre-8.42.tar.gz
cd pcre-8.42
./configure --prefix=/usr/local/pcre --with-apr=/usr/local/apr
make && make install

tar -zxvf httpd-2.4.38.tar.gz
cd httpd-2.4.38/support/
在编译前修改ab.c
vi httpd-2.4.38/support/ab.c
#define MAX_CONCURRENCY 100000 #(默认20000 修改为100000)
cd ..
./configure --prefix=/usr/local/apache --with-pcre=/usr/local/pcre --with-apr=/usr/local/apr --with-apr-util=/usr/local/apr-util
make && make install

cd/usr/local/apache/bin
./ab -c 50000 -n 100000 http://192.168.2.11/index.html
压力测试5万并发10万连接数