Memory leak

[prot]

Hello guys!
I've got a memory leak in carrying host of my cacti monitoring system. SNMP daemon is working on the host and you can see the leaking progress below. When the host is rebooted, I've got about 1Gb of free memory. After 24 hours available memory decreases to 500Mb and continue leaking.

Here are parameters of my system:

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$ cat /etc/redhat-release 
CentOS release 5.4 (Final)

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$ uname -a
Linux cacti.localdomain 2.6.18-164.11.1.el5 #1 SMP Wed Jan 20 07:32:21 EST 2010 x86_64 x86_64 x86_64 GNU/Linux

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$ php -v
PHP 5.1.6 (cli) (built: Jan 13 2010 17:09:42) 
Copyright (c) 1997-2006 The PHP Group
Zend Engine v2.1.0, Copyright (c) 1998-2006 Zend Technologies

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$ mysql -V
mysql  Ver 14.12 Distrib 5.0.77, for redhat-linux-gnu (x86_64) using readline 5.1

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Cacti 0.8.7e

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$ /usr/local/spine/bin/spine -v
SPINE 0.8.7e  Copyright 2002-2009 by The Cacti Group

If you need some additional information, please ask and I'll post it here.
Any help is appreciated. Thank you in anticipation.

[Linegod]

That's not a memory leak.

Read up on how the Linux memory cache works.