vicidial.org

on the day the memory is constantly fully up to 96%. We have 7 agents with predictive dialing dial factor about 3 by full recording. Quad CPU 4 GB of RAM. After a reboot, the memory only about 30% capacity. It is up to the recordings?

You can check out this link for answers:

http://www.faqs.org/docs/linux_admin/buffer-cache.html

and

http://gentoo-wiki.com/FAQ_Linux_Memory_Management

put a cron with this, each 30 minutes

sync; echo 3 > /proc/sys/vm/drop_caches