From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 5626 invoked by alias); 8 Jan 2010 13:21:35 -0000 Received: (qmail 5615 invoked by uid 22791); 8 Jan 2010 13:21:35 -0000 X-SWARE-Spam-Status: No, hits=-2.3 required=5.0 tests=AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from smtp3.ugent.be (HELO smtp3.UGent.be) (157.193.49.127) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 08 Jan 2010 13:21:31 +0000 Received: from localhost (mcheck2.ugent.be [157.193.49.249]) by smtp3.UGent.be (Postfix) with ESMTP id 88EBF1477F0; Fri, 8 Jan 2010 14:21:29 +0100 (CET) Received: from smtp3.UGent.be ([157.193.49.127]) by localhost (mcheck2.ugent.be [157.193.43.11]) (amavisd-new, port 10024) with ESMTP id o2NnyjDT3yTd; Fri, 8 Jan 2010 14:21:29 +0100 (CET) Received: from mail.elis.ugent.be (mail.elis.UGent.be [157.193.206.48]) by smtp3.UGent.be (Postfix) with ESMTP id C3B8314784C; Fri, 8 Jan 2010 14:21:28 +0100 (CET) Received: from localhost (localhost [127.0.0.1]) by mail.elis.ugent.be (Postfix) with ESMTP id 9568C918F19; Fri, 8 Jan 2010 14:21:28 +0100 (CET) Received: from mail.elis.ugent.be ([127.0.0.1]) by localhost (mail.elis.ugent.be [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id DbsibebiS2wc; Fri, 8 Jan 2010 14:21:25 +0100 (CET) Received: from bigmac.elis.UGent.be (bigmac.elis.UGent.be [157.193.206.33]) by mail.elis.ugent.be (Postfix) with ESMTP id 338A6918F10; Fri, 8 Jan 2010 14:21:25 +0100 (CET) Cc: Phil Muldoon , gdb@sourceware.org Message-Id: From: Jonas Maebe To: Joel Brobecker In-Reply-To: <20100108131258.GO4623@adacore.com> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v936) Subject: Re: time to be serious about dropping CVS Date: Fri, 08 Jan 2010 13:21:00 -0000 References: <20100101080137.GP2788@adacore.com> <4B472BDC.1030301@redhat.com> <20100108131258.GO4623@adacore.com> X-j-chkmail-Enveloppe: 4B473158.004/157.193.206.48/mail.elis.UGent.be/mail.elis.ugent.be/ X-j-chkmail-Score: MSGID : 4B473158.004 on smtp3.UGent.be : j-chkmail score : . : R=. U=. O=. B=0.000 -> S=0.000 X-j-chkmail-Status: Ham X-IsSubscribed: yes Mailing-List: contact gdb-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gdb-owner@sourceware.org X-SW-Source: 2010-01/txt/msg00066.txt.bz2 On 08 Jan 2010, at 14:12, Joel Brobecker wrote: >> I don't know why CVS is so slow. Whether it is CPU bound on the >> sourceware machine, or the bandwidth at the hosting site is at >> capacity .. who knows? I'm not even sure how to find out. But would >> SVN solve any of the problem relating to performance? > > My observations on SVN is that it is a huge I/O hog. I don't know > what it's doing, and how it encodes it's meta data, but you definitely > feel it when your home directory is not on a local hard drive. That's indeed true. As far as I know, it's due to svn creating lock files (or lock attributes) in every sub directory of the current working directory when performing any operation that might modify anything (unless you perform a non-recursive operation, but those are rare). I guess the reason is that svn allows treating every subdirectory as a separate "repository" should you wish to do so, so e.g. a commit in gdb/intl could be executed in parallel with an update gdb/bfd, since both would be locked separately. The downside is obviously that updating gdb requires locking gdb/ and also all of its subdirectories. Afaik, in case of git the entire repository is atomic and hence it doesn't have to lock/unlock all the subdirectories every time. Jonas