Message-ID: <4640FC3B.3000608@commandprompt.com>
Date: Tue, 08 May 2007 15:39:55 -0700
From: "Joshua D. Drake" <jd@commandprompt.com>
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To: Carlos Moreno <moreno_pg@mochima.com>
CC: pgsql-performance@postgresql.org
Subject: Re: Throttling PostgreSQL's CPU usage
References: <p0624080bc266892a91b2@[192.168.1.8]>
	<20070508205120.GA7983@uio.no> <4640FA6E.4050003@mochima.com>
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Carlos Moreno wrote:
> Steinar H. Gunderson wrote:
>> Or use a dual-core system. :-)
> 
> Am I missing something??  There is just *one* instance of this idea in, 
> what,
> four replies??  I find it so obvious, and so obviously the only solution 
> that
> has any hope to work, that it makes me think I'm missing something ...
> 
> Is it that multiple PostgreSQL processes will end up monopolizing as many
> CPU cores as you give it?  (ok, that would suck, for sure  :-))


PostgreSQL is process based, so if you have one query that is eating a 
lot of cpu, it is only one cpu... you would have another for your render 
to run on.

Joshua D. Drake

> 
> If there is a way to guarantee (or at least to encourage) that PG will 
> not use
> more than one, or even two cores, then a quad-core machine looks like a
> promising solution...  One thing feels kind of certain to me:  the kind of
> system that the OP describes has a most-demanding need for *extremely
> high* CPU power --- multi-core, or multi-CPU, would seem the better
> solution anyway, since it promotes responsiveness more than raw CPU
> power.
> 
> Carlos
> -- 
> 
> 
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