Want to do some performance testing on your Centos 6.4 Server.
Try UnixBench
OK, lets login to your server and install all the need application etc.
# yum install gcc gcc-c++ make libXext-devel mesa-libGL-devel perl-Time-HiRes
# wget -c http://byte-unixbench.googlecode.com/files/unixbench-5.1.2.tar.gz
# tar xvzf unixbench-5.1.2.tar.gz
# cd unixbench-5.1.2
# make
# ./Run Let it run, once it is finished you should have some performance stats about your server.
Do you need some other stats so you can see how your server performs. Goto http://serverbear.com/ and you can compare to over 2000 over servers.
References:
https://code.google.com/p/byte-unixbench
https://my.vps6.net/knowledgebase/1/Install-and-Run-UnixBench-on-CentOS-or-Debian-VPS.html