From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from mail4-relais-sop.national.inria.fr (mail4-relais-sop.national.inria.fr [192.134.164.105]) by yquem.inria.fr (Postfix) with ESMTP id 27D3CBBB8 for ; Sat, 12 Jul 2008 02:23:54 +0200 (CEST) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApACAEmWd0jAbSoIiGdsb2JhbACSLAEBAQ8gl2Y X-IronPort-AV: E=Sophos;i="4.30,348,1212357600"; d="scan'208";a="27254072" Received: from einhorn.in-berlin.de ([192.109.42.8]) by mail4-smtp-sop.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-SHA; 12 Jul 2008 02:23:53 +0200 X-Envelope-From: oliver@first.in-berlin.de Received: from einhorn.in-berlin.de (localhost [127.0.0.1]) by einhorn.in-berlin.de (8.13.6/8.13.6/Debian-1) with ESMTP id m6C0NkoW024094 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Sat, 12 Jul 2008 02:23:46 +0200 Received: (from www-data@localhost) by einhorn.in-berlin.de (8.13.6/8.13.6/Submit) id m6C0NjAh024092; Sat, 12 Jul 2008 02:23:45 +0200 X-Authentication-Warning: einhorn.in-berlin.de: www-data set sender to oliver@first.in-berlin.de using -f Received: from dslb-088-073-104-121.pools.arcor-ip.net (dslb-088-073-104-121.pools.arcor-ip.net [88.73.104.121]) by webmail.in-berlin.de (IMP) with HTTP for ; Sat, 12 Jul 2008 02:23:45 +0200 Message-ID: <1215822225.4877f991876d5@webmail.in-berlin.de> Date: Sat, 12 Jul 2008 02:23:45 +0200 From: Oliver Bandel To: peng.zang@gmail.com Cc: caml-list@yquem.inria.fr, Brian Hurt , Gerd Stolpmann Subject: Re: [Caml-list] thousands of CPU cores References: <1215717356.24773.17.camel@flake.lan.gerd-stolpmann.de> <200807111101.46248.peng.zang@gmail.com> In-Reply-To: <200807111101.46248.peng.zang@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit User-Agent: Internet Messaging Program (IMP) 3.2.6 X-Scanned-By: MIMEDefang_at_IN-Berlin_e.V. on 192.109.42.8 X-Spam: no; 0.00; bandel:01 in-berlin:01 hash:01 gerd:01 stolpmann:01 ticked:01 wikipedia:01 wiki:01 peng:98 peng:98 threads:01 wrote:01 wrote:01 oliver:01 oliver:01 Zitat von Peng Zang : > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On Thursday 10 July 2008 11:01:31 pm Brian Hurt wrote: > > On Thu, 10 Jul 2008, Gerd Stolpmann wrote: > > > I wouldn't take this article too seriously. It's just > speculation. > > > > I would take the article seriously. > > > > > Just open up your mind to this perspective: It's a big risk for > the CPU > > > vendors to haven taken the direction to multi-core. > > > > *Precisely*. It also stands in stark contrast to the last 50 or so > years > > of CPU development, which focused around making single-threaded > code > > faster. And, I note, it's not just one CPU manufacturer who has > done this > > (which could be chalked up to stupid management or stupid > engineers)- but > > *every* CPU manufacturer. And what do they get out of it, other > than > > ticked off software developers grumbling about having to switch to > > multithreaded code? > > I think we can all agree that more computing units being used in > parallel is > going to be the future. The main point here is that a shared-memory > architecture is not necessarily (and in my opinion doubtful) the > approach > that will be taken for large numbers of CPUs. [...] For example, if you have a non-profit research project, you can use the BOINC infrastructure, which provides about 580000 PCs to help you :) http://en.wikipedia.org/wiki/Berkeley_Open_Infrastructure_for_Network_Computing There is no Shared-Mem as we know it from our local PCs, there is distributed calculation around the whole planet. Threads will not help there ;-) Ciao, Oliver