From mboxrd@z Thu Jan 1 00:00:00 1970 From: "C. Scott Ananian" Subject: Re: [PATCH] add the ability to create and retrieve delta objects Date: Tue, 3 May 2005 11:57:12 -0400 (EDT) Message-ID: References: <200505030657.38309.alonz@nolaviz.org> <200505030724.57827.mason@suse.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Nicolas Pitre , Linus Torvalds , Alon Ziv , git@vger.kernel.org X-From: git-owner@vger.kernel.org Tue May 03 17:52:37 2005 Return-path: Received: from vger.kernel.org ([12.107.209.244]) by ciao.gmane.org with esmtp (Exim 4.43) id 1DSzgZ-0004IZ-5M for gcvg-git@gmane.org; Tue, 03 May 2005 17:51:47 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261799AbVECP57 (ORCPT ); Tue, 3 May 2005 11:57:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261800AbVECP57 (ORCPT ); Tue, 3 May 2005 11:57:59 -0400 Received: from sincerity-forever.csail.mit.edu ([128.30.67.31]:55256 "EHLO sincerity-forever.csail.mit.edu") by vger.kernel.org with ESMTP id S261799AbVECP54 (ORCPT ); Tue, 3 May 2005 11:57:56 -0400 Received: from catfish.lcs.mit.edu ([128.30.67.25] helo=cag.csail.mit.edu) by sincerity-forever.csail.mit.edu with esmtp (Exim 3.36 #1 (Debian)) id 1DSzm4-0007xe-00; Tue, 03 May 2005 11:57:28 -0400 To: Chris Mason In-Reply-To: <200505030724.57827.mason@suse.com> Sender: git-owner@vger.kernel.org Precedence: bulk X-Mailing-List: git@vger.kernel.org On Tue, 3 May 2005, Chris Mason wrote: > your delta generator later this week. Some quick and dirty space numbers to > show why we need to pack the files together: Are you accurately accounting for the cost of the extra hard/soft links your scheme requires? Ie the directories get larger, lookups take slightly longer, etc. Also access to a given file takes longer, and the deltas are referring to *other* packed files which *also* take longer to decompress and access... How much better does delta-fication do, compared to just packing? --scott NSA FJDEFLECT radar WASHTUB justice LCFLUTTER KUCLUB PBHISTORY Ft. Bragg ammunition immediate ESMERALDITE DC terrorist C4 SLBM affinity group ( http://cscott.net/ )