From: Dave Cramer <davec@fastcrypt.com>
To: Andrew Sullivan <ajs@crankycanuck.ca>
Cc: pgsql-performance@postgresql.org
Subject: Re: How much ram is too much
Date: Mon, 11 Jun 2007 13:22:04 -0400
Message-ID: <330ACA8C-3FD0-45C1-BD56-DD68B8CC8343@fastcrypt.com> (raw)
In-Reply-To: <20070611153414.GK24327@phlogiston.dyndns.org>
References: <47A154B5-496C-478A-B60D-4238AF12EAC6@fastcrypt.com>
<D4B7C576-0CC5-43B2-9BD6-7F38D5E12FB9@decibel.org>
<E32FCBD3-0DD1-463B-AD5F-309E06F815D9@fastcrypt.com>
<20070611153414.GK24327@phlogiston.dyndns.org>
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@crankycanuck.ca
> The whole tendency of modern prose is away from concreteness.
> --George Orwell
>
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To: pgsql-performance@postgresql.org
Cc: davec@fastcrypt.com, ajs@crankycanuck.ca
Subject: Re: How much ram is too much
In-Reply-To: <330ACA8C-3FD0-45C1-BD56-DD68B8CC8343@fastcrypt.com>
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