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Re: How much ram is too much

From: Andrew Sullivan <ajs(at)crankycanuck(dot)ca>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: How much ram is too much
Date: 2007-06-11 15:34:14
Message-ID: 20070611153414.GK24327@phlogiston.dyndns.org (view raw or flat)
Thread:
Lists: pgsql-performance
On Mon, Jun 11, 2007 at 11:09:42AM -0400, Dave Cramer wrote:
> >and set them to anything remotely close to 128GB.
> 
> Well, we'd give 25% of it to postgres, and the rest to the OS.

Are you quite sure that PostgreSQL's management of the buffers is
efficient with such a large one?  In the past, that wasn't the case
for relatively small buffers; with the replacement of single-pass
LRU, that has certainly changed, but I'd be surprised if anyone
tested a buffer as large as 32G.

A

-- 
Andrew Sullivan  | ajs(at)crankycanuck(dot)ca
The whole tendency of modern prose is away from concreteness.
		--George Orwell

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