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Re: Performance on SUSE w/ reiserfs

From: Jon Brisbin <jon(dot)brisbin(at)npcinternational(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Performance on SUSE w/ reiserfs
Date: 2005-10-10 22:15:27
Message-ID: 434AE7FF.4000705@npcinternational.com (view raw or flat)
Thread:
Lists: pgsql-performance
Tom Lane wrote:
> 
> Are you sure it's not cached data pages, rather than cached inodes?
> If so, the above behavior is *good*.
> 
> People often have a mistaken notion that having near-zero free RAM means
> they have a problem.  In point of fact, that is the way it is supposed
> to be (at least on Unix-like systems).  This is just a reflection of the
> kernel doing what it is supposed to do, which is to use all spare RAM
> for caching recently accessed disk pages.  If you're not swapping then
> you do not have a problem.

Except for the fact that my Java App server crashes when all the 
available memory is being used by caching and not reclaimed :-)

If it wasn't for the app server going down, I probably wouldn't care.

-- 

Jon Brisbin
Webmaster
NPC International, Inc.

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