Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964924AbWAWUWj (ORCPT ); Mon, 23 Jan 2006 15:22:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932472AbWAWUWj (ORCPT ); Mon, 23 Jan 2006 15:22:39 -0500 Received: from mail15.syd.optusnet.com.au ([211.29.132.196]:40629 "EHLO mail15.syd.optusnet.com.au") by vger.kernel.org with ESMTP id S932466AbWAWUWh (ORCPT ); Mon, 23 Jan 2006 15:22:37 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17365.15058.133950.726063@wombat.chubb.wattle.id.au> Date: Tue, 24 Jan 2006 07:21:38 +1100 From: Peter Chubb To: Jamie Lokier Cc: Chase Venters , Michael Loftis , "Barry K. Nathan" , Al Boldi , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: Re: [RFC] VM: I have a dream... In-Reply-To: <20060123131707.GA20163@mail.shareable.org> References: <200601212108.41269.a1426z@gawab.com> <986ed62e0601221155x6a57e353vf14db02cc219c09@mail.gmail.com> <200601222346.24781.chase.venters@clientec.com> <20060123131707.GA20163@mail.shareable.org> X-Mailer: VM 7.17 under 21.4 (patch 17) "Jumbo Shrimp" XEmacs Lucid Comments: Hyperbole mail buttons accepted, v04.18. X-Face: GgFg(Z>fx((4\32hvXq<)|jndSniCH~~$D)Ka:P@e@JR1P%Vr}EwUdfwf-4j\rUs#JR{'h# !]])6%Jh~b$VA|ALhnpPiHu[-x~@<"@Iv&|%R)Fq[[,(&Z'O)Q)xCqe1\M[F8#9l8~}#u$S$Rm`S9% \'T@`:&8>Sb*c5d'=eDYI&GF`+t[LfDH="MP5rwOO]w>ALi7'=QJHz&y&C&TE_3j! Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1404 Lines: 31 >>>>> "Jamie" == Jamie Lokier writes: Jamie> Chase Venters wrote: >> Just as a curiosity... does anyone have any guesses as to the >> runtime performance cost of hosting one or more swap files (which >> thanks to on demand creation and growth are presumably built of >> blocks scattered around the disk) versus having one or more simple >> contiguous swap partitions? >> I think it's probably a given that swap partitions are better; I'm >> just curious how much better they might actually be. Jamie> When programs must access files in addition to swapping, and Jamie> that includes demand-paged executable files, swap files have Jamie> the _potential_ to be faster because they provide opportunities Jamie> to use the disk nearer the files which are being accessed. If you can, put your swap on a different spindle... Actually, the original poster's `dream' looked a lot like a single-address-space operating system, such as Mungi ( http://www.cse.unsw.edu.au/~disy/Mungi/ ) -- Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au http://www.ertos.nicta.com.au ERTOS within National ICT Australia - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/