From owner-freebsd-hackers@FreeBSD.ORG Mon Oct 4 15:43:06 2010 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 361C110656A4; Mon, 4 Oct 2010 15:43:06 +0000 (UTC) (envelope-from me@zan.st) Received: from mail-pw0-f54.google.com (mail-pw0-f54.google.com [209.85.160.54]) by mx1.freebsd.org (Postfix) with ESMTP id 0F15F8FC1B; Mon, 4 Oct 2010 15:43:05 +0000 (UTC) Received: by pwi8 with SMTP id 8so1726452pwi.13 for ; Mon, 04 Oct 2010 08:43:05 -0700 (PDT) Received: by 10.142.132.15 with SMTP id f15mr8783372wfd.299.1286205540554; Mon, 04 Oct 2010 08:19:00 -0700 (PDT) MIME-Version: 1.0 Received: by 10.42.165.4 with HTTP; Mon, 4 Oct 2010 08:18:40 -0700 (PDT) X-Originating-IP: [187.35.28.248] In-Reply-To: <4CA630F5.9060500@networx.ch> References: <4CA630F5.9060500@networx.ch> From: stephano zanzin Date: Mon, 4 Oct 2010 12:18:40 -0300 Message-ID: To: Andre Oppermann Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-Content-Filtered-By: Mailman/MimeDel 2.1.5 Cc: freebsd-hackers@freebsd.org, freebsd-current@freebsd.org Subject: Re: Very interesting paper: An Analysis of Linux Scalability to many Cores X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Oct 2010 15:43:06 -0000 Very interesting! Thanks On Fri, Oct 1, 2010 at 4:05 PM, Andre Oppermann wrote= : > Just saw the link to a very interesting paper on SMP scalability. > A very good read and highly relevant for our efforts as well. In > certain areas we may already fare better, in others we still have > some work to do. > > An Analysis of Linux Scalability to many Cores > > ABSTRACT > This paper analyzes the scalability of seven system applications > (Exim, memcached, Apache, PostgreSQL, gmake, Psearchy, and MapReduce) > running on Linux on a 48-core computer. Except for gmake, all > applications trigger scalability bottlenecks inside a recent Linux > kernel. Using mostly standard parallel programming techniques=97 > this paper introduces one new technique, sloppy counters=97 > these bottlenecks can be removed from the kernel or avoided by > changing the applications slightly. Modifying the kernel required > in total 3002 lines of code changes. A speculative conclusion from > this analysis is that there is no scalability reason to give up on > traditional operating system organizations just yet. > > http://pdos.csail.mit.edu/papers/linux:osdi10.pdf > > -- > Andre > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org= " > --=20 stephano