From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on yquem.inria.fr X-Spam-Level: X-Spam-Status: No, score=0.7 required=5.0 tests=AWL,SPF_FAIL autolearn=disabled version=3.1.3 X-Original-To: caml-list@yquem.inria.fr Delivered-To: caml-list@yquem.inria.fr Received: from discorde.inria.fr (discorde.inria.fr [192.93.2.38]) by yquem.inria.fr (Postfix) with ESMTP id E59E8BC68 for ; Wed, 27 Sep 2006 23:10:58 +0200 (CEST) Received: from ciao.gmane.org (main.gmane.org [80.91.229.2]) by discorde.inria.fr (8.13.6/8.13.6) with ESMTP id k8RLAwHQ023117 (version=TLSv1/SSLv3 cipher=AES256-SHA bits=256 verify=NO) for ; Wed, 27 Sep 2006 23:10:58 +0200 Received: from list by ciao.gmane.org with local (Exim 4.43) id 1GSgfu-0002fb-K6 for caml-list@inria.fr; Wed, 27 Sep 2006 23:10:38 +0200 Received: from arbutus.physics.mcmaster.ca ([130.113.172.142]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 27 Sep 2006 23:10:38 +0200 Received: from cookedm+news by arbutus.physics.mcmaster.ca with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Wed, 27 Sep 2006 23:10:38 +0200 X-Injected-Via-Gmane: http://gmane.org/ To: caml-list@inria.fr From: cookedm+news@physics.mcmaster.ca (David M. Cooke) Subject: Re: Regarding SMP computing Date: Wed, 27 Sep 2006 17:10:24 -0400 Message-ID: References: <4517C7FE.8080102@mcmaster.ca> <20060925194153.GA20467@furbychan.cocan.org> <87lko7g1mm.fsf@wanadoo.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Complaints-To: usenet@sea.gmane.org X-Gmane-NNTP-Posting-Host: arbutus.physics.mcmaster.ca X-Message-Flag: If you can read this, you're standing too close User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) Cancel-Lock: sha1:oQBiaoV80rCF4rWrY3xaiVhdk+I= Sender: news X-Miltered: at discorde with ID 451AE8E2.000 by Joe's j-chkmail (http://j-chkmail.ensmp.fr)! X-Spam: no; 0.00; peyton-jones:01 parallelism:01 2006:98 wrote:01 garbage:01 writes:01 writes:01 ghc:01 mcmaster:02 mcmaster:02 jacques:03 guess:04 mpi:04 mpi:04 fix:04 Yoann Padioleau writes: > Richard Jones writes: > >> On Mon, Sep 25, 2006 at 08:13:50AM -0400, Jacques Carette wrote: >>> Over on Haskell-cafe, Simon Peyton-Jones says: >>> "GHC 6.6 (release candidate available) supports parallel execution on >>> SMP machines. >>> >>> Garbage collection is not parallelised yet, something we plan to fix >>> this autumn." >>> >>> A bit of competition is a good thing, isn't it? >> >> Can someone explain how/if this is better than using MPI for >> parallelism? The reason I ask is that we are starting to use MPI for >> real on SMP machines to process our larger datasets. > > I guess that with a working shared-memory SMP support, you > don't pay the communication cost you have with MPI. Unless, of course, your MPI implementation uses shared memory on SMP systems. -- |>|\/|< /--------------------------------------------------------------------------\ |David M. Cooke |cookedm(at)physics(dot)mcmaster(dot)ca