How to install apache benchmark on CentOS

You can discover which package contains the program you want using yum provides:

yum provides /usr/bin/ab

Then you will see that ab is in the httpd-tools package.

And now you can install it:

yum install httpd-tools

参考资料

[1]. http://serverfault.com/questions/514401/how-to-install-apache-benchmark-on-centos