From owner-freebsd-amd64@FreeBSD.ORG Thu Jan 26 20:21:37 2006 Return-Path: X-Original-To: freebsd-amd64@freebsd.org Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 80C4816A420 for ; Thu, 26 Jan 2006 20:21:37 +0000 (GMT) (envelope-from ohartman@uni-mainz.de) Received: from mailgate2.zdv.Uni-Mainz.DE (mailgate2.zdv.Uni-Mainz.DE [134.93.178.130]) by mx1.FreeBSD.org (Postfix) with ESMTP id 1B80843D53 for ; Thu, 26 Jan 2006 20:21:36 +0000 (GMT) (envelope-from ohartman@uni-mainz.de) Received: from [134.93.180.123] (ipamzra.Physik.Uni-Mainz.DE [134.93.180.123]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mailgate2.zdv.Uni-Mainz.DE (Postfix) with ESMTP id 83028300067B; Thu, 26 Jan 2006 21:21:35 +0100 (CET) Message-ID: <43D92F4F.8000702@uni-mainz.de> Date: Thu, 26 Jan 2006 21:21:35 +0100 From: "O. Hartmann" User-Agent: Thunderbird 1.5 (Windows/20051201) MIME-Version: 1.0 To: Lars Tunkrans References: <20060124110334.40e81208.kgunders@teamcool.net> <43D66D52.2090008@bredband.net> In-Reply-To: <43D66D52.2090008@bredband.net> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Virus-Scanned: by amavisd-new at uni-mainz.de Cc: freebsd-amd64@freebsd.org Subject: Re: dual vs single core opteron 100's X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 26 Jan 2006 20:21:37 -0000 Lars Tunkrans schrieb: > Ken Gunderson wrote: > >> Greets Everyone: >> >> I was getting into a discussion the other day about this and decided to >> see what the FBSD amd64 gurus had to say about it. Given approximately >> equal cost of, for example, a single core Opteron150 (2.4GHz) and a >> dual core Opteron165 (1.8GHz) under what kind of situations would >> one be preferred over the other? >> fwiw- my friend asserts it will ALWAYS be the faster single core because >> of context switches and dual cores are optimized for highly multi- >> threaded OS's (e.g. WInblows). But 1) I think the scheduler has been >> improved in 6.0, and 2) he's a linuxer. >> >> And yes, I know what AMD has to say on this but am interested in the >> FBSD community's perspective on this w.r.t. FBSD. >> >> TIA >> >> >> > The DUAL core will be prefferd for Webservers, Application servers, > and databases > that are multithreaded and transaction oriented. > The singel Core will be preffered for Simulations, Compute intensive > stuff - image Rendering , > Games , that are singel threaded. There are some performance tests around the net concerning povray. Povray performs much better on a dual core than a single CPU, if it is multithreaded. In many cases, such as modelling, numbercrunching, multi-core or multi CPU systems perform much better than single core/CPU systems! That depends higly on the way the programmer of the application has aimed multithreading.