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 1HreaV-0003wq-Ex for garchives@archives.gentoo.org; Fri, 25 May 2007 18:32:31 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.14.0/8.14.0) with SMTP id l4PIVJkI013179; Fri, 25 May 2007 18:31:19 GMT Received: from an-out-0708.google.com (an-out-0708.google.com [209.85.132.250]) by robin.gentoo.org (8.14.0/8.14.0) with ESMTP id l4PIQaX4007754 for ; Fri, 25 May 2007 18:26:38 GMT Received: by an-out-0708.google.com with SMTP id c8so267406ana for ; Fri, 25 May 2007 11:26:33 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=iiWLR6ci3IaZA7L36drR/0Nqnk18Qgl8xbaFENSGO1/D0EgjFlnOo9jpfFdABs/ohj9bZmqp1H5Cc3Rju6sNvNuu3zeRJ1nqDziwzDPw0B0H9l9BnSAcn/Pon6173R8Fefh/uZVyk/cEEQ1e2FYrLc/IKrg12Pbs6yvUtt/GoHY= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=tY/+JT8Yzva+mNuFpMhZQ7UTvuwEfLFdZ6OcVO1/uADhUFp1H7qTEkzVqtQRKSVK6SM36ngJMZUWslFCLThNHnWBDb/nXVB2iRo/EKR/puZg8XOQg2/7+1E/SrsJpD1Qt193suJx5KVycolxZWv4/trDDxjFW2MOkEjTctJe0ds= Received: by 10.115.22.1 with SMTP id z1mr1619519wai.1180117592329; Fri, 25 May 2007 11:26:32 -0700 (PDT) Received: by 10.114.72.10 with HTTP; Fri, 25 May 2007 11:26:32 -0700 (PDT) Message-ID: Date: Fri, 25 May 2007 14:26:32 -0400 From: Denis To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] which -march flag to pick for Intel Core 2 Duo in make.conf? In-Reply-To: <72bdee2f0705251003g5075c767pff4252bc9ed28638@mail.gmail.com> 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=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <72bdee2f0705251003g5075c767pff4252bc9ed28638@mail.gmail.com> X-Archives-Salt: 4f6ea879-0ea2-4a25-afe8-8bda70f715e3 X-Archives-Hash: b5511a52027af0da24f18bf2bbdf250c 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? -- gentoo-user@gentoo.org mailing list