[Ilugc] Memory utilization issue

[Anandh Gurusamy]

Thanks Raja,
		That was a good explination. Our application team is
trying to install Oracle Applications and they reported this free memory
problem while installing some module in it. I will coordinate with them
and find out what exactly is the problem and will try to resolve it.

Thanks for your help

Regards,
Anandh G

-----Original Message-----
From: ilugc-bounces at ae.iitm.ac.in [mailto:ilugc-bounces at ae.iitm.ac.in]
On Behalf Of Raja Subramanian
Sent: Thursday, May 01, 2008 11:47 AM
To: ILUG-C
Subject: Re: [Ilugc] Memory utilization issue

There is no real problem with your server.  You just need to understand
how the VM works.

RAM (VM pages really) can be in the following key states:

> 1. active -- allocated to an application and in active use.  This RAM
should never be swapped to disk because the application is "actively"
using it.  Swapping it out to disk will only cause the VM to reload it
back into RAM and thus start thrashing swap.

> 2. inactive -- allocated to an application, but the app has not
accessed this memory recently.  Inactive RAM can be swapped out to disk.
If the application touches inactive RAM, it immediately becomes active
RAM (no performance penalty).  But if the VM is out of free memory, it
allocates from inactive RAM.

> 3. free -- unallocated free memory that's not in use and can be
readily mapped to any application.
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