Instale o apr-util (precisa executar o ab):
yum install apr-util
Instale o yum-utils:
yum install yum-utils
Faça o download do httpd an extract ab:
mkdir ~/httpd
cd ~/httpd
yumdownloader httpd
rpm2cpio httpd-2.2.3-43.el5.centos.3.i386.rpm | cpio -idmv
mv usr/bin/ab /usr/bin/ab
cd ~
rm -rf ~/httpd
Executar ab:
ab http://google.ru/
This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0