From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.62) (envelope-from ) id 1HtZKj-0004zh-DC for garchives@archives.gentoo.org; Thu, 31 May 2007 01:20:09 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.14.0/8.14.0) with SMTP id l4V1Iqp1016788; Thu, 31 May 2007 01:18:52 GMT Received: from spore.ath.cx (c-24-245-14-14.hsd1.mn.comcast.net [24.245.14.14]) by robin.gentoo.org (8.14.0/8.14.0) with ESMTP id l4V1BrH8008000 for ; Thu, 31 May 2007 01:11:54 GMT Received: from pascal.spore.ath.cx (pascal.spore.ath.cx [192.168.1.100]) by spore.ath.cx (Postfix) with ESMTP id DE03236639 for ; Wed, 30 May 2007 20:11:53 -0500 (CDT) Date: Wed, 30 May 2007 20:11:53 -0500 From: Dan Farrell To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] which -march flag to pick for Intel Core 2 Duo in make.conf? Message-ID: <20070530201153.5496d3f7@pascal.spore.ath.cx> In-Reply-To: References: <72bdee2f0705251003g5075c767pff4252bc9ed28638@mail.gmail.com> Organization: Spore, Ltd. X-Mailer: Claws Mail 2.9.1 (GTK+ 2.10.6; x86_64-pc-linux-gnu) Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-user@gentoo.org Reply-to: gentoo-user@lists.gentoo.org Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Archives-Salt: 7ff58004-0569-425d-b23f-d89c0e743249 X-Archives-Hash: 3d654b2d59f0c383f3dd5bedf8027453 On Fri, 25 May 2007 14:26:32 -0400 Denis wrote: > On 5/25/07, Andreas Claesson wrote: > > Since you (Denis) are doing a lot of mathematical calculations you > > will probably benefit from running in 64bit mode. > > I often need to run Monte Carlo simulations (in C) which involve a lot > of array storage and array scanning/searching operations... I wonder > what the speed-up would be for those simulations if run under a 64-bit > mode. Are there any requirements on how the simulations should be > programmed in order to take advantage of the 64-bit arch, or is that > automatically done by the GCC compiler and the kernel? Would you mind telling us what kind of performance difference you experience? -- gentoo-user@gentoo.org mailing list