Date: Thu, 26 Jan 2006 21:21:35 +0100 From: "O. Hartmann" <ohartman@uni-mainz.de> To: Lars Tunkrans <lars.tunkrans@bredband.net> Cc: freebsd-amd64@freebsd.org Subject: Re: dual vs single core opteron 100's Message-ID: <43D92F4F.8000702@uni-mainz.de> In-Reply-To: <43D66D52.2090008@bredband.net> References: <20060124110334.40e81208.kgunders@teamcool.net> <43D66D52.2090008@bredband.net>
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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.
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