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From: Greg Smith <gsmith@gregsmith.com>
To: pgsql-performance@postgresql.org
Subject: Re: New to PostgreSQL, performance considerations
Date: Tue, 12 Dec 2006 01:35:04 -0500 (EST)
Message-ID: <Pine.GSO.4.64.0612120118340.10640@westnet.com> (raw)
In-Reply-To: <20061212013706.GM16692@mathom.us>
References: <87u002mv49.fsf@wolfe.cbbrowne.com>
	<8a0c7af10612110531sbb019ck259fb16d131fdb50@mail.gmail.com>
	<60psaq5t94.fsf@dba2.int.libertyrms.com>
	<E1GtolA-0008Fk-4R@elasmtp-banded.atl.sa.earthlink.net>
	<20061211173105.GH16692@mathom.us>
	<E1Gtplp-0004Ka-GM@elasmtp-junco.atl.sa.earthlink.net>
	<20061211184726.GI16692@mathom.us>
	<E1GtrB8-0005rw-Iu@elasmtp-kukur.atl.sa.earthlink.net>
	<457DA782.3060506@modgraph-usa.com>
	<8a0c7af10612111422x6bdcc0c2p7cbfeb5a7b0e0374@mail.gmail.com>
	<20061212013706.GM16692@mathom.us>

On Mon, 11 Dec 2006, Michael Stone wrote:

> Can anyone else reproduce these results? I'm on similar hardware (2.5GHz P4, 
> 1.5G RAM)...

There are two likely candidates for why Daniel's P4 3.0GHz significantly 
outperforms your 2.5GHz system.

1) Most 2.5GHZ P4 processors use a 533MHz front-side bus (FSB); most 
3.0GHZ ones use an 800MHz bus.

2) A typical motherboard paired with a 2.5GHz era processor will have a 
single-channel memory interface; a typical 3.0GHZ era board supports 
dual-channel DDR.

These changes could easily explain the magnitude of difference in results 
you're seeing, expecially when combined with a 20% greater raw CPU clock.

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



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