From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: Performance issue of 'git branch' Date: Fri, 24 Jul 2009 13:36:13 -0700 (PDT) Message-ID: References: <20090723012207.GA9368@Pilar.aei.mpg.de> <7vtz146mgr.fsf@alter.siamese.dyndns.org> <20090723160740.GA5736@Pilar.aei.mpg.de> <20090723165335.GA15598@Pilar.aei.mpg.de> <20090723195548.GA28494@Pilar.aei.mpg.de> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Junio C Hamano , Git Mailing List To: "Carlos R. Mafra" X-From: git-owner@vger.kernel.org Fri Jul 24 22:39:22 2009 Return-path: Envelope-to: gcvg-git-2@gmane.org Received: from vger.kernel.org ([209.132.176.167]) by lo.gmane.org with esmtp (Exim 4.50) id 1MURXt-00041c-E4 for gcvg-git-2@gmane.org; Fri, 24 Jul 2009 22:39:13 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753704AbZGXUhF (ORCPT ); Fri, 24 Jul 2009 16:37:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754152AbZGXUhF (ORCPT ); Fri, 24 Jul 2009 16:37:05 -0400 Received: from smtp1.linux-foundation.org ([140.211.169.13]:60222 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754136AbZGXUhD (ORCPT ); Fri, 24 Jul 2009 16:37:03 -0400 Received: from imap1.linux-foundation.org (imap1.linux-foundation.org [140.211.169.55]) by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with ESMTP id n6OKaD1u030422 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 24 Jul 2009 13:36:14 -0700 Received: from localhost (localhost [127.0.0.1]) by imap1.linux-foundation.org (8.13.5.20060308/8.13.5/Debian-3ubuntu1.1) with ESMTP id n6OKaDvP003810; Fri, 24 Jul 2009 13:36:13 -0700 X-X-Sender: torvalds@localhost.localdomain In-Reply-To: <20090723195548.GA28494@Pilar.aei.mpg.de> User-Agent: Alpine 2.01 (LFD 1184 2008-12-16) X-Spam-Status: No, hits=-3.46 required=5 tests=AWL,BAYES_00 X-Spam-Checker-Version: SpamAssassin 3.2.4-osdl_revision__1.47__ X-MIMEDefang-Filter: lf$Revision: 1.188 $ X-Scanned-By: MIMEDefang 2.63 on 140.211.169.13 Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: On Thu, 23 Jul 2009, Carlos R. Mafra wrote: > > After 7 tests I got these, > > time: > > 0.61 +/- 0.08 Btw, I think 0.61s is still too much. Can you send me the output of 'strace -Ttt' on your machine? It's entirely possible that it's all the actual binary (and shared library) loading, of course. You do have a slow harddisk. But it takes 0.035s for me, and I'm wondering if there is something else than just CPU speed and IO speed accounting for the 20x performance difference. (That said, maybe 20x is right - my SSD latency almost certainly is 20x better). Linus