How to install PECL package APC on ubuntu
Before you start, you may know that if you have installed the apache-prefork-mpm package on your ubuntu distribution, you should install apache-prefork-dev to build correctly APC.
After installing apc, you should set apc parameters correctly in file apc.ini according to your needs.
Further informations about APC are available below :
http://us.php.net/apc
http://www.slideshare.net/search/slideshow?q=apc+php