X-Original-To: pgsql-performance-postgresql.org@localhost.postgresql.org Received: from localhost (mx1.hub.org [200.46.208.251]) by postgresql.org (Postfix) with ESMTP id 5782211F6223 for ; Wed, 26 Apr 2006 19:16:46 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.208.251]) (amavisd-new, port 10024) with ESMTP id 40655-02 for ; Wed, 26 Apr 2006 19:16:35 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey- Received: from noel.decibel.org (noel.decibel.org [67.100.216.10]) by postgresql.org (Postfix) with ESMTP id 7C07D11F628C for ; Wed, 26 Apr 2006 19:16:33 -0300 (ADT) Received: by noel.decibel.org (Postfix, from userid 1001) id B186D56423; Wed, 26 Apr 2006 17:16:33 -0500 (CDT) Received: (hashcash-sendmail, from uid 1001); Wed, 26 Apr 2006 17:16:31 -0500 Date: Wed, 26 Apr 2006 17:16:31 -0500 From: "Jim C. Nasby" To: Ron Peacetree Cc: mark@mark.mielke.cc, Scott Marlowe , Bill Moran , pgsql-performance@postgresql.org Subject: Re: Large (8M) cache vs. dual-core CPUs Message-ID: <20060426221631.GA97354@pervasive.com> References: <8991088.1146020837420.JavaMail.root@elwamui-mouette.atl.sa.earthlink.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8991088.1146020837420.JavaMail.root@elwamui-mouette.atl.sa.earthlink.net> X-Operating-System: FreeBSD 6.0-RELEASE-p4 amd64 X-Distributed: Join the Effort! http://www.distributed.net User-Agent: Mutt/1.5.11 X-Hashcash: 1:20:060426:rjpeace@earthlink.net::/J+ct5xuUu7MwOsu:0000000000000000 0000000000000000000000003T1q X-Hashcash: 1:20:060426:mark@mark.mielke.cc::3FUZHiVDPHysPRNh:000000000000000000 0000000000000000000000000qeA X-Hashcash: 1:20:060426:smarlowe@g2switchworks.com::QCZsAhL3JkJ8NMah:00000000000 0000000000000000000000002CbS X-Hashcash: 1:20:060426:wmoran@collaborativefusion.com::KJyB8Rs6KSxyT7Jr:0000000 000000000000000000000000G3DU X-Hashcash: 1:20:060426:pgsql-performance@postgresql.org::712UEAit4ob6LeMK:00000 0000000000000000000000004D95 X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200604/612 X-Sequence-Number: 18696 On Tue, Apr 25, 2006 at 11:07:17PM -0400, Ron Peacetree wrote: > A minor point to be noted in addition here is that most DB servers under load are limited by their physical IO subsystem, their HDs, and not the speed of their RAM. I think if that were the only consideration we wouldn't be seeing such a dramatic difference between AMD and Intel though. Even in a disk-bound server, caching is going to have a tremendous impact, and that's essentially entirely bound by memory bandwith and latency. -- Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com Pervasive Software http://pervasive.com work: 512-231-6117 vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461