From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263817AbTDXSYA (ORCPT ); Thu, 24 Apr 2003 14:24:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263818AbTDXSYA (ORCPT ); Thu, 24 Apr 2003 14:24:00 -0400 Received: from turing-police.cc.vt.edu ([128.173.14.107]:23681 "EHLO turing-police.cc.vt.edu") by vger.kernel.org with ESMTP id S263817AbTDXSX6 (ORCPT ); Thu, 24 Apr 2003 14:23:58 -0400 Message-Id: <200304241835.h3OIZxvj006418@turing-police.cc.vt.edu> X-Mailer: exmh version 2.6.3 04/04/2003 with nmh-1.0.4+dev To: Henti Smith Cc: linux-kernel@vger.kernel.org Subject: Re: maximum possible memory limit .. In-Reply-To: Your message of "Thu, 24 Apr 2003 20:05:24 +0200." <20030424200524.5030a86b.bain@tcsn.co.za> From: Valdis.Kletnieks@vt.edu References: <20030424200524.5030a86b.bain@tcsn.co.za> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_-1095087500P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Thu, 24 Apr 2003 14:35:59 -0400 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_-1095087500P Content-Type: text/plain; charset=us-ascii On Thu, 24 Apr 2003 20:05:24 +0200, Henti Smith said: > I had a discussion with somebody watching the whole M$ server launch and > mentioned then new systems supports up to a terabyte of ram. Well.. sure.. it's easy enough to write something that supports plugging in a terabyte. The *tricky* part is supporting it well - you have page table issues, you have swapping/thrashing issues (if you *do* have to page something out, you're in trouble.. ;), you have process scheduling issues (how many Apache processes does it take to use up a terabyte? What's your load average at that point?), you have multi-processor scaling issues (you're gonna want to have 64+ processors, etc..) Consider - the number of machines with over a terabyte of RAM is limited: http://www.llnl.gov/asci/platforms/platforms.html That's the sort of box that has a terabyte. Do you *really* think that M$ 2003 has all the stuff needed to scale to THAT size? --==_Exmh_-1095087500P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.1 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQE+qC6OcC3lWbTT17ARAiTKAJ0dW8tQewctUVkGYWKkgUv/DHRQBQCgjwpi W4LsmUb6JnjdbMvfI3Kob+Q= =WdO8 -----END PGP SIGNATURE----- --==_Exmh_-1095087500P--