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=0.0 required=5.0 tests=AWL autolearn=disabled version=3.1.3 Received: from mail1-relais-roc.national.inria.fr (mail1-relais-roc.national.inria.fr [192.134.164.82]) by yquem.inria.fr (Postfix) with ESMTP id 54669BBAF for ; Fri, 11 Jul 2008 01:41:02 +0200 (CEST) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AiIDAK86dkjAbSoIiGdsb2JhbACSIwEBAQ8gSp5K X-IronPort-AV: E=Sophos;i="4.30,341,1212357600"; d="scan'208";a="14984452" Received: from einhorn.in-berlin.de ([192.109.42.8]) by mail1-smtp-roc.national.inria.fr with ESMTP/TLS/DHE-RSA-AES256-SHA; 11 Jul 2008 01:41:02 +0200 X-Envelope-From: oliver@first.in-berlin.de X-Envelope-To: 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 m6ANf0li028079 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Fri, 11 Jul 2008 01:41:01 +0200 Received: (from www-data@localhost) by einhorn.in-berlin.de (8.13.6/8.13.6/Submit) id m6ANf0PP028077 for caml-list@yquem.inria.fr; Fri, 11 Jul 2008 01:41:00 +0200 X-Authentication-Warning: einhorn.in-berlin.de: www-data set sender to oliver@first.in-berlin.de using -f Received: from dslb-088-073-112-087.pools.arcor-ip.net (dslb-088-073-112-087.pools.arcor-ip.net [88.73.112.87]) by webmail.in-berlin.de (IMP) with HTTP for ; Fri, 11 Jul 2008 01:41:00 +0200 Message-ID: <1215733260.48769e0cda5f9@webmail.in-berlin.de> Date: Fri, 11 Jul 2008 01:41:00 +0200 From: Oliver Bandel To: caml-list@yquem.inria.fr Subject: Re: [Caml-list] thousands of CPU cores References: <200807101500.03079.jon@ffconsultancy.com> <20080710222535.GA5579@annexia.org> <200807110004.54413.jon@ffconsultancy.com> In-Reply-To: <200807110004.54413.jon@ffconsultancy.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 0100,:01 ocaml:01 ocaml:01 10,:98 wrote:01 wrote:01 oliver:01 oliver:01 caml-list:01 unsafe:01 caml:02 slower:02 slower:02 Zitat von Jon Harrop : > On Thursday 10 July 2008 23:25:36 you wrote: > > On Thu, Jul 10, 2008 at 03:00:02PM +0100, Jon Harrop wrote: > > > OCaml is already ~8x slower than F# on today's eight core > desktops. > > > > You don't half talk a load of nonsense. MPI OCaml programs on 8 > cores > > are just as fast... > > You may recall that we already tested this and your fastest (unsafe) > OCaml > implementation of the (embarassingly parallel) matrix multiply > remains up to > 100x slower than my safe F# implementation: > > http://groups.google.com/group/fa.caml/msg/c3dbf6c5cdb3a898 [...] Sorry, but following this link, I could not found details on your comparison. Could please send the correct link, where you showed details? And a question to the message passing: which message passing technique from Ocaml did you use? Ciao, Oliver