I am implementing the apc on a shared server that currently has 1000 sites (using wordpress, moodle, etc.). I'm Looking for the admin page, and I see "Cache full count" is growing rapidly. I've tried increasing the value of "apc.shm_size" reduce value "apc.ttl" increase the value "apc.shm_segments" but I can not resolve this issue. What am I doing wrong? I'm putting down some information: apc.ini: extension=apc.so apc.shm_size = 256 apc.enabled = 1 apc.ttl = 300 apc.user_ttl = 300 Ubuntu: 12.04 PHP: 5.3.10 APC: 3.1.7 Server has 16GB memory Limit share memory: 256MB