From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: The Emacs master is much slower than the emacs-27 branch. Date: Sat, 05 Dec 2020 10:05:52 +0200 Message-ID: <83mtysd6e7.fsf@gnu.org> References: <877dpyzg9d.fsf@rub.de> <87czzpsyqn.fsf@gmx.net> <83o8j9eqwx.fsf@gnu.org> <874kl1spe9.fsf@gmx.net> <83blf9em55.fsf@gnu.org> <87zh2tr82r.fsf@gmx.net> <87v9dhr7i5.fsf@gmx.net> <838sadefiw.fsf@gnu.org> <87r1o5r22z.fsf@gmx.net> <87a6uty1qj.fsf@telefonica.net> <834kl1e75j.fsf@gnu.org> <87h7p1s154.fsf@gmx.net> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7277"; mail-complaints-to="usenet@ciao.gmane.io" Cc: ofv@wanadoo.es, emacs-devel@gnu.org To: Stephen Berman Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Dec 05 09:07:04 2020 Return-path: Envelope-to: ged-emacs-devel@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1klSat-0001mD-64 for ged-emacs-devel@m.gmane-mx.org; Sat, 05 Dec 2020 09:07:03 +0100 Original-Received: from localhost ([::1]:40770 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1klSas-0004o5-7w for ged-emacs-devel@m.gmane-mx.org; Sat, 05 Dec 2020 03:07:02 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51790) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1klSa4-0004LC-4e for emacs-devel@gnu.org; Sat, 05 Dec 2020 03:06:12 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:42621) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1klSa3-0003ne-39; Sat, 05 Dec 2020 03:06:11 -0500 Original-Received: from [176.228.60.248] (port=1372 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1klSa0-0002Fl-BL; Sat, 05 Dec 2020 03:06:10 -0500 In-Reply-To: <87h7p1s154.fsf@gmx.net> (message from Stephen Berman on Fri, 04 Dec 2020 22:37:59 +0100) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:260340 Archived-At: > From: Stephen Berman > Cc: Óscar Fuentes , emacs-devel@gnu.org > Date: Fri, 04 Dec 2020 22:37:59 +0100 > > > But I see no significant difference in my unoptimized builds of both > > branches. > > Doesn't -O0 mean unoptimized? It does. > But Gregory Heytings said that -O0 suffers the same performance hit > as -Og in emacs-27 but not im master, which your timings seem to > contradict. What am I missing? You aren't missing anything. If Gregory has timings of -O0 builds of both branches that show a significant effect of this issue, and which disappear at the bisection point, then there is indeed a strange contradiction between his and my timings.