debian的同学们直接apt-get 就有了

apt-get install cpulimit gawk

centos的就源码安装一下

yum -y --skip-broken install subversion gcc make gawk
cd /tmp
svn checkout https://cpulimit.svn.sourceforge.net/svnroot/cpulimit/trunk cpulimit
cd cpulimit
make
cp cpulimit /usr/bin/

官方地址：http://cpulimit.sourceforge.net/