Message-ID: <45EC82B2.7080100@tweakers.net>
Date: Mon, 05 Mar 2007 21:50:58 +0100
From: Arjen van der Meijden <acmmailing@tweakers.net>
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To: Tom Lane <tgl@sss.pgh.pa.us>
CC: Stefan Kaltenbrunner <stefan@kaltenbrunner.cc>,
	pgsql-performance@postgresql.org
Subject: Re: [kris@obsecurity.org: Progress on scaling of FreeBSD
	on 8 CPU systems]
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	<45EC02B4.2070409@kaltenbrunner.cc> <45EC0443.1070107@tweakers.net>
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	<22074.1173127131@sss.pgh.pa.us>
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On 5-3-2007 21:38 Tom Lane wrote:
> Keep in mind that Arjen's test exercises some rather narrow scenarios;
> IIRC its performance is mostly determined by some complicated
> bitmap-indexscan cases.  So that "30% slower" bit certainly doesn't
> represent an across-the-board figure.  As best I can tell, the decisions
> the planner happened to be making in late June were peculiarly nicely
> suited to his test, but not so much for other cases.

True, its not written as a database-comparison-test, but as a 
platform-comparison test. As I showed you back then, there where indeed 
querytypes faster on the final version (I still have that database of 
executed queries on dev and 8.2 rc1), especially after your three 
patches. Still, its a pitty that both the general performance and 
scalability seem to be worse on these platforms.

Best regards,

Arjen