RAM Usage Problem
Hi,Hope I'm posting in the right forums here.

Recently I've purchased a server with a dedicated server provider, the server is with the following specs:
AuthenticAMD, AMD Athlon(tm) XP 2800+
psa v7.5.4_build75051209.14 os_CentOS 3.3
1GB RAM
80GB hard drive.
Now, the issue is with the RAM, after 15hours of uptime, 66% of my RAM is already eaten up. And I've never seen my RAM usage go down. The server is not running anything heavy. Here's the load averages:
Uptime:
10:27:21 up 14:59, 0 users, load average: 0.02, 0.01, 0.00
The RAM usage will just keep going and going up, spilling over to the SWAP
space finally.
This is getting quite irritating. I've checked the free -m -o and have confirmed the
RAM usage in linux and have also checked the 'top' function from SSH and nothing
is amiss. No processes are shown to have used up the RAM that much.
A simple reboot would help bring the RAM usage to 20% or so but it'll climb
up again after a few hours and repeat itself. Emails to the datacenter also prove
to be of not much use. They'll do memswaps and checks and say there's nothing
wrong. But I'm pretty sure that's not true.
Can someone here advise?
Thanks!