From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 2668 invoked by alias); 4 Sep 2013 15:30:50 -0000 Mailing-List: contact libc-ports-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: libc-ports-owner@sourceware.org Received: (qmail 2659 invoked by uid 89); 4 Sep 2013 15:30:49 -0000 Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 04 Sep 2013 15:30:49 +0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-5.7 required=5.0 tests=AWL,BAYES_00,KHOP_THREADED,RP_MATCHES_RCVD autolearn=ham version=3.3.2 X-HELO: mx1.redhat.com Received: from int-mx02.intmail.prod.int.phx2.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id r84FUYrp023983 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK); Wed, 4 Sep 2013 11:30:34 -0400 Received: from [10.3.113.91] (ovpn-113-91.phx2.redhat.com [10.3.113.91]) by int-mx02.intmail.prod.int.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id r84FUVVL031558; Wed, 4 Sep 2013 11:30:31 -0400 Message-ID: <52275216.30008@redhat.com> Date: Wed, 04 Sep 2013 15:30:00 -0000 From: "Carlos O'Donell" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130805 Thunderbird/17.0.8 MIME-Version: 1.0 To: Siddhesh Poyarekar CC: =?UTF-8?B?T25kxZllaiBCw61sa2E=?= , Will Newton , "libc-ports@sourceware.org" , Patch Tracking Subject: Re: [PATCH] sysdeps/arm/armv7/multiarch/memcpy_impl.S: Improve performance. References: <5220D30B.9080306@redhat.com> <5220F1F0.80501@redhat.com> <52260BD0.6090805@redhat.com> <20130903173710.GA2028@domone.kolej.mff.cuni.cz> <522621E2.6020903@redhat.com> <20130903185721.GA3876@domone.kolej.mff.cuni.cz> <5226354D.8000006@redhat.com> <20130904073008.GA4306@spoyarek.pnq.redhat.com> In-Reply-To: <20130904073008.GA4306@spoyarek.pnq.redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2013-09/txt/msg00036.txt.bz2 On 09/04/2013 03:30 AM, Siddhesh Poyarekar wrote: > On Tue, Sep 03, 2013 at 03:15:25PM -0400, Carlos O'Donell wrote: >> I agree. The eventual goal of the project is to have some kind of >> whole system benchmarking that allows users to feed in their profiles >> and allow us as developers to see what users are doing with our library. >> >> Just like CPU designers feed in a whole distribution of applications >> and look at the probability of instruction selection and tweak instruction >> to microcode mappings. >> >> I am willing to accept a certain error in the process as long as I know >> we are headed in the right direction. If we all disagree about the >> direction we are going in then we should talk about it. >> >> I see: >> >> microbenchmarks -> whole system benchmarks -> profile driven optimizations > > I've mentioned this before - microbenchmarks are not a way to whole > system benchmarks in that they don't replace system benchmarks. We > need to work on both in parallel because both have different goals. Sorry, my ASCII graph was misleading, and I agree with you. What I meant to say is that we need to walk before we run. Creating a microbenchmark framework will give us the tools we need to move on to whole system benchmarks and eventually to profile driven optimizations. We will continue to do all 3 of these activities once we reach the end of that logical progression. Cheers, Carlos.