From owner-freebsd-hpc@FreeBSD.ORG Tue Feb 14 16:30:47 2006 Return-Path: X-Original-To: freebsd-hpc@freebsd.org Delivered-To: freebsd-hpc@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 9C2EB16A43D for ; Tue, 14 Feb 2006 16:30:47 +0000 (GMT) (envelope-from brdavis@odin.ac.hmc.edu) Received: from odin.ac.hmc.edu (Odin.AC.HMC.Edu [134.173.32.75]) by mx1.FreeBSD.org (Postfix) with ESMTP id 3EBE843D49 for ; Tue, 14 Feb 2006 16:30:47 +0000 (GMT) (envelope-from brdavis@odin.ac.hmc.edu) Received: from odin.ac.hmc.edu (localhost.localdomain [127.0.0.1]) by odin.ac.hmc.edu (8.13.0/8.13.0) with ESMTP id k1EGUkV9012627; Tue, 14 Feb 2006 08:30:46 -0800 Received: (from brdavis@localhost) by odin.ac.hmc.edu (8.13.0/8.13.0/Submit) id k1EGUk6d012626; Tue, 14 Feb 2006 08:30:46 -0800 Date: Tue, 14 Feb 2006 08:30:46 -0800 From: Brooks Davis To: Aluminium Oxide Message-ID: <20060214163046.GA8572@odin.ac.hmc.edu> References: <1139894933.16845.254309588@webmail.messagingengine.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="fUYQa+Pmc3FrFX/N" Content-Disposition: inline In-Reply-To: <1139894933.16845.254309588@webmail.messagingengine.com> User-Agent: Mutt/1.4.1i X-Virus-Scanned: by amavisd-new X-Spam-Status: No, hits=0.0 required=8.0 tests=none autolearn=no version=2.63 X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on odin.ac.hmc.edu Cc: freebsd-hpc@freebsd.org Subject: Re: HPC: Using Message Passing to distribute threads X-BeenThere: freebsd-hpc@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "FreeBSD in High Performance Computing environments." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 14 Feb 2006 16:30:47 -0000 --fUYQa+Pmc3FrFX/N Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable [Dropped irrelevent mailing lists. In general CCing lists at multiple sites is bad form]. On Tue, Feb 14, 2006 at 03:58:53PM +1030, Aluminium Oxide wrote: > Forgive me if I am suggesting that we reinvent the wheel, but I have a > problem with a potentially simple solution. >=20 > It concerns the difficulty of adapting an application to use a parallel > computing system, such as with MPI or PVM. >=20 > I would like help possible to write a simple (heh heh) compiler > directive, or header, or a wrapper function which allows one to add a > tag or wrap a function call to a function which will be called > iteratively to spawn not just a new thread, but a new thread ***which > can be passed to another node*** in a parallel computer system? >=20 > This seems like a very simple and elegant method by which > non-parallelised code can be adapted to a parallel architecture. That you're describing is functionally if not syntatcicaly identical to OpenMP. http://en.wikipedia.org/wiki/OpenMP GCC's GOMP project is creating such a implementation for SMP systems at: http://savannah.nongnu.org/projects/gomp/ Note that this won't work for a cluster, there have been implementations of OpenMP on top of message passing libraries, but codes and clusters where such implementations make sense given the communication overhead are rare. -- Brooks --=20 Any statement of the form "X is the one, true Y" is FALSE. PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4 --fUYQa+Pmc3FrFX/N Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) iD8DBQFD8gW0XY6L6fI4GtQRAmnCAKCNyUmlU59AhPlSmRTccEha9U4KYgCfSpAE 713XHA63388Q+R9GYKe66lg= =LW0v -----END PGP SIGNATURE----- --fUYQa+Pmc3FrFX/N--