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Re: How much ram is too much

From: Dave Cramer <davec(at)fastcrypt(dot)com>
To: Andrew Sullivan <ajs(at)crankycanuck(dot)ca>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: How much ram is too much
Date: 2007-06-11 17:22:04
Message-ID: 330ACA8C-3FD0-45C1-BD56-DD68B8CC8343@fastcrypt.com (view raw or flat)
Thread:
Lists: pgsql-performance
Hi Andrew
On 11-Jun-07, at 11:34 AM, Andrew Sullivan wrote:

> 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?

No, I'm not sure of this.
> 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.

So does anyone have experience above 32G ?

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