From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: svn to git, N-squared? Date: Mon, 12 Jun 2006 09:12:16 -0700 (PDT) Message-ID: References: <20060612043949.20992.qmail@science.horizon.com> <9e4733910606120832xaf74e77pad7f70df864541fc@mail.gmail.com> <9e4733910606120855p1cec9acfy62dadb89c11756b4@mail.gmail.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: "linux@horizon.com" , git@vger.kernel.org X-From: git-owner@vger.kernel.org Mon Jun 12 18:12:41 2006 Return-path: Envelope-to: gcvg-git@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by ciao.gmane.org with esmtp (Exim 4.43) id 1Fpp1j-0004cM-NP for gcvg-git@gmane.org; Mon, 12 Jun 2006 18:12:32 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752116AbWFLQMX (ORCPT ); Mon, 12 Jun 2006 12:12:23 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752117AbWFLQMX (ORCPT ); Mon, 12 Jun 2006 12:12:23 -0400 Received: from smtp.osdl.org ([65.172.181.4]:54458 "EHLO smtp.osdl.org") by vger.kernel.org with ESMTP id S1752116AbWFLQMV (ORCPT ); Mon, 12 Jun 2006 12:12:21 -0400 Received: from shell0.pdx.osdl.net (fw.osdl.org [65.172.181.6]) by smtp.osdl.org (8.12.8/8.12.8) with ESMTP id k5CGCHgt017742 (version=TLSv1/SSLv3 cipher=EDH-RSA-DES-CBC3-SHA bits=168 verify=NO); Mon, 12 Jun 2006 09:12:18 -0700 Received: from localhost (shell0.pdx.osdl.net [10.9.0.31]) by shell0.pdx.osdl.net (8.13.1/8.11.6) with ESMTP id k5CGCGW1026275; Mon, 12 Jun 2006 09:12:16 -0700 To: Jon Smirl In-Reply-To: <9e4733910606120855p1cec9acfy62dadb89c11756b4@mail.gmail.com> X-Spam-Status: No, hits=0 required=5 tests= X-Spam-Checker-Version: SpamAssassin 2.63-osdl_revision__1.75__ X-MIMEDefang-Filter: osdl$Revision: 1.135 $ X-Scanned-By: MIMEDefang 2.36 Sender: git-owner@vger.kernel.org Precedence: bulk X-Mailing-List: git@vger.kernel.org Archived-At: On Mon, 12 Jun 2006, Jon Smirl wrote: > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 14525 jonsmirl 16 0 604m 391m 1904 S 24 38.7 916:53.39 git-svnimport > 20947 jonsmirl 17 0 0 0 0 R 1 0.0 0:00.03 git-svnimport Hard to tell, it's obviously got short-lived processes there too that it's not showing, but equally obviously that svnimport script itself is spending an alarming amount of CPU time. I don't think it should do that much processing, but since it's written in perl, I can't read it. Are there any other directories that seem to be growing (eg some temp-file directory where the old files aren't cleaned away?). I can't imagine what else it could be doing in kernel space than simply some silly filesystem operation, but dang it all, Linux filesystems are usually very efficient indeed, unless we're talking huge directories (and if it's not the git object directory any more, it must be something else). At least with the cvs importer I have _some_ clue what it's doing, since I wrote an earlier version myself (very different, but at least I know what the operations are). SVN has always just confused me, and I have no idea what svnimport does, so I think I'll have to defer to somebody who actually knows the code. Smurf, have you looked at any larger repositories? Linus