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From: Greg Smith <gsmith@gregsmith.com>
To: Postgresql Performance list <pgsql-performance@postgresql.org>
Subject: Re: New to PostgreSQL, performance considerations
Date: Fri, 15 Dec 2006 09:50:15 -0500 (EST)
Message-ID: <Pine.GSO.4.64.0612150945440.7368@westnet.com> (raw)
In-Reply-To: <b42b73150612150623s761783c8l9093b2637a1f0c6c@mail.gmail.com>
References: <C1A31C39.15548%llonergan@greenplum.com>
	<Pine.GSO.4.64.0612140950460.11833@westnet.com>
	<4CD99FDA-14B5-4EA9-9440-55E2548C34C1@purefiction.net>
	<E1GuwGL-0004LX-2x@elasmtp-spurfowl.atl.sa.earthlink.net>
	<BCA64E3D-E764-432B-82CB-C2FC75CF3104@purefiction.net>
	<E1Gv0ko-0004Ht-Jx@elasmtp-scoter.atl.sa.earthlink.net>
	<CA660CCB-712C-442F-A48D-4152EF0EFF01@purefiction.net>
	<E1Gv3Rc-0007M7-5X@elasmtp-galgo.atl.sa.earthlink.net>
	<09D6591B-4AA9-4994-BED6-0C7C583BF933@purefiction.net>
	<E1GvBfR-0005f3-11@elasmtp-scoter.atl.sa.earthlink.net>
	<b42b73150612150623s761783c8l9093b2637a1f0c6c@mail.gmail.com>

On Fri, 15 Dec 2006, Merlin Moncure wrote:

> The slower is probably due to the unroll loops switch which can
> actually hurt code due to the larger footprint (less cache coherency).

The cache issues are so important with current processors that I'd suggest 
throwing -Os (optimize for size) into the mix people test.  That one may 
stack usefully with -O2, but probably not with -O3 (3 includes 
optimizations that increase code size).

--
* Greg Smith gsmith@gregsmith.com http://www.gregsmith.com Baltimore, MD



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