From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCH v3 0/3] automatically skip away from broken commits Date: Mon, 15 Jun 2009 06:16:05 -0700 Message-ID: <4A364995.2010703@zytor.com> References: <20090606043853.4031.78284.chriscool@tuxfamily.org> <7vtz2nlrfs.fsf@alter.siamese.dyndns.org> <200906110602.54861.chriscool@tuxfamily.org> <4A308B5D.2010704@zytor.com> <4A309083.9090907@zytor.com> <4A33F7E4.4020201@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Christian Couder , Junio C Hamano , git@vger.kernel.org, Sam Vilain , Ingo Molnar To: Christian Couder X-From: git-owner@vger.kernel.org Mon Jun 15 15:17:59 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 1MGC4R-0003yH-Ik for gcvg-git-2@gmane.org; Mon, 15 Jun 2009 15:17:55 +0200 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754480AbZFONRP (ORCPT ); Mon, 15 Jun 2009 09:17:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751641AbZFONRN (ORCPT ); Mon, 15 Jun 2009 09:17:13 -0400 Received: from terminus.zytor.com ([198.137.202.10]:50970 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751604AbZFONRM (ORCPT ); Mon, 15 Jun 2009 09:17:12 -0400 Received: from mail.hos.anvin.org (c-98-210-181-100.hsd1.ca.comcast.net [98.210.181.100]) (authenticated bits=0) by terminus.zytor.com (8.14.3/8.14.1) with ESMTP id n5FDGBxv030107 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Mon, 15 Jun 2009 06:16:12 -0700 Received: from tazenda.hos.anvin.org (tazenda.hos.anvin.org [172.27.0.16]) by mail.hos.anvin.org (8.14.3/8.14.3) with ESMTP id n5FDGAQN019164; Mon, 15 Jun 2009 06:16:10 -0700 Received: from tazenda.hos.anvin.org (localhost.localdomain [127.0.0.1]) by tazenda.hos.anvin.org (8.14.3/8.13.6) with ESMTP id n5FDG5vL004717; Mon, 15 Jun 2009 06:16:06 -0700 User-Agent: Thunderbird 2.0.0.14 (X11/20080501) In-Reply-To: X-Virus-Scanned: ClamAV 0.94.2/9467/Mon Jun 15 01:11:58 2009 on terminus.zytor.com X-Virus-Status: Clean Sender: git-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: git@vger.kernel.org Archived-At: Christian Couder wrote: > Yes, but I feared that there could be rounding related differences > between platforms. Doesn't matter for this application. Really. Anything you're going to do yourself will be much worse. Realistically, you might have a difference in the 53rd bit. > By the way, could you explain why power 1.5 is better than 2? It would > be much simpler if we could avoid square rooting anything in the first > place. It is the power function that most closely creates a distribution which matches the value curve (rounded to a small fraction.) > I don't think this is a real problem for this application. In fact I > think it's already quite overkill and there are better things to do, > like looking for a commit on a different branch among the first ones > in the list, if we want to improve the current behavior. > > So unless there is a real flaw, I am going to work on something else. Makes sense. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.