Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261169AbUDZWbP (ORCPT ); Mon, 26 Apr 2004 18:31:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261468AbUDZWbP (ORCPT ); Mon, 26 Apr 2004 18:31:15 -0400 Received: from e2.ny.us.ibm.com ([32.97.182.102]:58804 "EHLO e2.ny.us.ibm.com") by vger.kernel.org with ESMTP id S261169AbUDZWbN (ORCPT ); Mon, 26 Apr 2004 18:31:13 -0400 Subject: Re: sched_domains and Stream benchmark From: Darren Hart To: lkml Cc: Andi Kleen In-Reply-To: References: <1N7xQ-7fh-29@gated-at.bofh.it> Content-Type: text/plain Message-Id: <1083018633.3070.8.camel@farah> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 Date: Mon, 26 Apr 2004 15:30:34 -0700 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1539 Lines: 37 On Tue, 2004-04-20 at 11:58, Andi Kleen wrote: > Darren Hart writes: > > > Andi, > > > > You have mentioned the stream benchmark when reporting on the > > performance of the Opteron NUMA sched-domains scheduler. I am trying to > > reproduce your results and am struggling with the benchmark. Can you > > rpovide the details of the tests you ran. Namely your compiler > > settings, compile command line, and your value of N. Also I didn't see > > how to specify the number of threads to run, how did you specify that? > > I have a 4 way 1.4 GHz 1MB cache opteron machine with 7 GB of RAM. > > I didn't actually compile them myself; someone sent me executables > compiled with the PGI compiler. Maybe your compiler has a different > runtime and behaves differently? > > You can find them and my test script that tests everything in > ftp://ftp.suse.com/pub/people/ak/bench/stream.tar.gz Thanks Andi, I noticed your binary ran with N=2000000 which is only sufficient for a 2 proc 1 MB cache opteron box according to the documentation on the stream faq. I also noticed wide variation in results (25% or so) when running with 4 threads on a 4 proc opteron on linux-2.6.5-mm5. Can you provide me with the specs of the system you ran your tests on? Thanks, Darren - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/