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 4.60) (envelope-from ) id 1GPMGV-00052o-Gv for garchives@archives.gentoo.org; Mon, 18 Sep 2006 16:46:40 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.13.8/8.13.6) with SMTP id k8IGj640025449; Mon, 18 Sep 2006 16:45:06 GMT Received: from sccrmhc12.comcast.net (sccrmhc12.comcast.net [204.127.200.82]) by robin.gentoo.org (8.13.8/8.13.6) with ESMTP id k8IGdYsx024591 for ; Mon, 18 Sep 2006 16:39:35 GMT Received: from fuggle.veldy.net (c-69-180-171-46.hsd1.mn.comcast.net[69.180.171.46]) by comcast.net (sccrmhc12) with ESMTP id <200609181639310120065j1me>; Mon, 18 Sep 2006 16:39:31 +0000 Received: from [127.0.0.1] (gw.veldy.net [192.168.1.3]) by fuggle.veldy.net (Postfix) with ESMTP id 7B3BD17037 for ; Mon, 18 Sep 2006 11:39:36 -0500 (CDT) Message-ID: <450ECBC2.8090409@veldy.net> Date: Mon, 18 Sep 2006 11:39:30 -0500 From: "Thomas T. Veldhouse" User-Agent: Thunderbird 1.5.0.7 (Windows/20060909) 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 To: gentoo-user@lists.gentoo.org Subject: Re: [gentoo-user] 64-bit system? References: <49bf44f10609180718w301ebaacx89d175031e6774a7@mail.gmail.com> <7573e9640609180849g1f1cb882le265a37fbc4981@mail.gmail.com> In-Reply-To: <7573e9640609180849g1f1cb882le265a37fbc4981@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Archives-Salt: 223b9491-22b8-44db-9b86-e5886cc1b55b X-Archives-Hash: 4240d40732b48b00f81802745d7ff4a5 Richard Fish wrote: > On 9/18/06, Grant wrote: >> I'm putting together a new system and I'm considering going 64-bit. >> Is the benefit of such a system pretty much speed? What are the >> drawbacks of using a 64-bit system with Gentoo? > > You'll only notice a speed increase with applications that need to > caculate very large numbers, like encryption keys and certain > scientific apps. Everything else will basically run just as fast in > 32-bit mode as it will in 64-bit. There are exceptions in certain > media encoders that don't have hardware optimizations for 64-bit, that > may actually run faster as 32-bit apps. Applications compiled in 64-bit mode can address larger blocks of memory without paging. Memory intensive applications can greatly benefit from this. Another minor difference is that chess engines based upon bitboards (i.e. Crafty and GnuChess), when compiled in 64-bit mode will perform much faster due to the fact that an entire board representation fits into a single WORD. On 32-bit systems, such a board is split between two words and there is overhead with juggling this deficit. Tom Veldhouse -- gentoo-user@gentoo.org mailing list