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From: Dave Cramer <pg@fastcrypt.com>
To: Craig A. James <cjames@modgraph-usa.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Hyperthreading slows processes?
Date: Sun, 20 Nov 2005 20:24:24 -0500
Message-ID: <C875A76F-AC09-4207-97D6-DE7969244146@fastcrypt.com> (raw)
In-Reply-To: <4380EEA2.4010002@modgraph-usa.com>
References: <BF9F6C0E.13B4A%llonergan@greenplum.com>
	<1132136225.5711.4.camel@Panoramix>
	<437B9DA9.2030806@modgraph-usa.com>
	<20051117002344.GA55377@winnie.fuhr.org>
	<437CF055.6020602@modgraph-usa.com>
	<20051117232857.GA49910@winnie.fuhr.org>
	<437D3085.9040207@modgraph-usa.com>
	<20051118034631.GA70159@winnie.fuhr.org>
	<437F66CF.7080402@modgraph-usa.com>
	<20051119190304.GJ7330@mathom.us>
	<4380EEA2.4010002@modgraph-usa.com>

Yeah, it's pretty much a known issue for postgres

Dave
On 20-Nov-05, at 4:46 PM, Craig A. James wrote:

> This article on ZDNet claims that hyperthreading can *hurt*  
> performance, due to contention in the L1/L2 cache by a second process:
>
>   http://news.zdnet.co.uk/0,39020330,39237341,00.htm
>
> Has anyone tested this on Postgres yet?  (And based on a recent  
> somewhat caustic thread about performance on this forum, I'm going  
> to avoid speculation, and let those who actually *know* answer! ;-)
>
> Craig
>
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