From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by walapai.inria.fr (8.13.6/8.13.6) with ESMTP id p3NAIL7f003998 for ; Sat, 23 Apr 2011 12:18:21 +0200 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: At0BAC6nsk3RVdW2kWdsb2JhbACXa4Y9hzgIFAEBAQEHDQsHFAQhqGOKeIInhDA0iF4BAQMGhXAEhXCIRYoSOg X-IronPort-AV: E=Sophos;i="4.64,258,1301868000"; d="scan'208";a="81579450" Received: from mail-yx0-f182.google.com ([209.85.213.182]) by mail3-smtp-sop.national.inria.fr with ESMTP/TLS/RC4-SHA; 23 Apr 2011 12:17:54 +0200 Received: by yxl31 with SMTP id 31so480439yxl.27 for ; Sat, 23 Apr 2011 03:17:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=vZYc32kdeKD1XQCb/BrkUk4u6wL1qKGKkQyNGGZV0CA=; b=J94KRy4+ABc/hQIh7NH2PcMywYiBldDFuUkGJ25iAsnf4NX7PCqcbCIT2WlcBqgTiI D+OivoM2Izx6TI6FAv4dcNuitZxe6OtO581kc8wAigWzDDDpgA/rnn258nXkEt+9C+7a 8c/sGAtFtFa8TWsACEkGvvZdVOwwAa5+KE4js= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=EeRZwktocsEpXLaSHmSEhxBDZBhnTcSBHQntov5n9FC+0LtRDRahprGMg8pUHp9ukL S8w4BDeFfKmVhxqu7xnUw/QX/ySbNuC9FGIAa1kMIhCs1aiDwlfC/wM1LSIA1Gf6pMQI uvZzjb+0IjKD63PwIR5mAdGUbO5nWYCZsxqR4= MIME-Version: 1.0 Received: by 10.150.240.17 with SMTP id n17mr1844312ybh.277.1303553872984; Sat, 23 Apr 2011 03:17:52 -0700 (PDT) Received: by 10.147.171.13 with HTTP; Sat, 23 Apr 2011 03:17:52 -0700 (PDT) In-Reply-To: <1303463512.8429.1344.camel@thinkpad> References: <76544177.594058.1303341821437.JavaMail.root@zmbs4.inria.fr> <4DAFE141.7080003@inria.fr> <4DAFF442.8000806@lexifi.com> <799994864.610698.1303412613509.JavaMail.root@zmbs4.inria.fr> <4DB136FB.6050302@inria.fr> <1303463512.8429.1344.camel@thinkpad> Date: Sat, 23 Apr 2011 13:17:52 +0300 Message-ID: From: Eray Ozkural To: Gerd Stolpmann Cc: Fabrice Le Fessant , caml-list@inria.fr Content-Type: multipart/alternative; boundary=000e0cd2c2468b79d804a19349ff Subject: Re: [Caml-list] Efficient OCaml multicore -- roadmap? --000e0cd2c2468b79d804a19349ff Content-Type: text/plain; charset=ISO-8859-1 I don't really care what others say, but to prove that this has any performance value you should do the following: Compare your most "parallel" algorithm with the performance of a corresponding well-written MPI application using openmpi's shared memory transport. If there is a difference, then your system has some value. Of course openmpi's shared memory transport is terribly buggy, but it should give a baseline acceptable performance. If there is no comparison, we have no idea. Best, -- Eray Ozkural, PhD candidate. Comp. Sci. Dept., Bilkent University, Ankara http://groups.yahoo.com/group/ai-philosophy http://myspace.com/arizanesil http://myspace.com/malfunct --000e0cd2c2468b79d804a19349ff Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I don't really care what others say, but to prove that this has any per= formance value you should do the following:


Compare your most "parallel" algorithm with the performance of= a corresponding well-written MPI application using openmpi's shared me= mory transport. If there is a difference, then your system has some value.<= /div>

Of course openmpi's shared memory transport is terr= ibly buggy, but it should give a baseline acceptable performance.

If there is no comparison, we have no idea.

Best,


--
Eray Ozkural, PhD candidat= e.=A0 Comp. Sci. Dept., Bilkent University, Ankara
http://groups.yahoo.com/group/ai-philoso= phy
http://myspace.com/arizanesil= http://myspace.com/malfunct
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