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From: Craig A. James <cjames@modgraph-usa.com>
Cc: pgsql-performance@postgresql.org
Subject: Hyperthreading slows processes?
Date: Sun, 20 Nov 2005 13:46:10 -0800
Message-ID: <4380EEA2.4010002@modgraph-usa.com> (raw)
In-Reply-To: <20051119190304.GJ7330@mathom.us>
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	<437B9DA9.2030806@modgraph-usa.com>
	<20051117002344.GA55377@winnie.fuhr.org>
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	<20051117232857.GA49910@winnie.fuhr.org>
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	<20051118034631.GA70159@winnie.fuhr.org>
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	<20051119190304.GJ7330@mathom.us>

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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