From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stephen Berman Newsgroups: gmane.emacs.devel Subject: Re: The Emacs master is much slower than the emacs-27 branch. Date: Fri, 04 Dec 2020 10:32:16 +0100 Message-ID: <87czzpsyqn.fsf@gmx.net> References: <877dpyzg9d.fsf@rub.de> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="38642"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: emacs-devel@gnu.org To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Dec 04 10:38:40 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 1kl7Y0-0009xa-1e for ged-emacs-devel@m.gmane-mx.org; Fri, 04 Dec 2020 10:38:40 +0100 Original-Received: from localhost ([::1]:34034 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kl7Xz-0000bK-3C for ged-emacs-devel@m.gmane-mx.org; Fri, 04 Dec 2020 04:38:39 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:42266) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kl7S2-0002pi-Pn for emacs-devel@gnu.org; Fri, 04 Dec 2020 04:32:30 -0500 Original-Received: from mout.gmx.net ([212.227.15.18]:53885) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kl7S0-00018q-O0 for emacs-devel@gnu.org; Fri, 04 Dec 2020 04:32:30 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1607074344; bh=dmP/NuQyhiebNmA45LMZ6cMgANUVi3wmDWGAkUcAnKA=; h=X-UI-Sender-Class:From:To:Cc:Subject:References:Date:In-Reply-To; b=lzYx3VMmsyCERPtAAI8yuav0nCLJY+RtsmAtGeWdNNPoifK32DdvQ1gpv23go4VVJ AZ2FXmxsX9lmtgxmFuEekJTUPj+1ALuIxhXQS/dl6yEzbPc59IhBo0OK1kDYwReDwK 8dH3cXtKc2VxbJAdFd35pC4xilQOprEXvXmqp4mg= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Original-Received: from strobe-jhalfs ([178.6.218.210]) by mail.gmx.com (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MC30Z-1kt8r70HKH-00CQRo; Fri, 04 Dec 2020 10:32:24 +0100 In-Reply-To: (Alan Mackenzie's message of "Fri, 4 Dec 2020 09:04:49 +0000") X-Provags-ID: V03:K1:UsXG3Zq1qdNkPIhJaoZdaPVsGx3j8GlvWG2MHgs/IMNSWMoBUdH CdHJAFglzw3o8OPvHPf32Cdxvq/9xK8SHXpTEa+wwyZZhPXI+IhjX9B54skcjRtbNMU/WXA dZhmcm0GRHq+BxNGhmF+nXbkecs7pv/8Jyg9trzzRtAIZzKzKpJWxaigOUCRAHMtQZLg3BK t2Aq6vb9sOBdFJKIDncig== X-UI-Out-Filterresults: notjunk:1;V03:K0:iJNM+6QEQbk=:aHXIhcBzOnYsvFa/Xs9icQ +DJCBdoeoX7399rG31VRxlaOoUXazWiKP0opBwa7A4vptcamw4geoqcWzXMg1uZL2ZIld1o9x 5AlvqH/3nvyzJnvPeSnEAHdX/S2Yz/x+pEJ3Ik4+MgIHfi6DtN6oAkGmBP+kGF1XaJ9ubkhpO rAAEMOufD3ifdBMG+GLHImN56vPvdedr5gHOVy8DkrPQp6yI9VrKg6a+8rgOYyE8aVICTA4Ez jNeRCMOOn9eAlVvV0pf8kc++G1sEdyP57U2a7l8BDlnBeeBc5guGEz7sPKcxhCtb9jAzywld8 tDfBrOyVdDyrhcqzUhhlDHJGLhpB6JNT3rVczY7MyKdDdwC/fXVwnLS95inwhPob4SPF1KCPE 1oPIE7GcBjHXgrBMvDdsi4IQJO4ratac/YHgRzYuumUNGcdQEUIyIMy/jF9NRtDJnH64HLOwd F6Zz12TsiBptQuz+yPzkatEz2+jTO9EHKgmZMZ4mnpxQ6xyOU0pFw6SEPElgD5u4mbQKtpdGo skDEs84JYH1QpUnE+ujyD5ATfXkhC2KnLWe14UBFk4W0G/jcDOrNvCKGUqEZK5abuBBwA9PFr 5poj7WqN6T2JEfdf05v8g5kJnGIozri2Dkk+8rux0zxJfq7+GJqcxML/q7wwpG2myBUMNw1/f +ywZxeE/LrhaGSrfbRVmhjCMl+kLe4itGcSr9d8p+iF+A3s5cZBELiomTPZGm/4NlqiSZmp6K J04md18iocNZFYhxo9z+AhUa8wt6Y4C0abfYsq2GDUW4XYS4FY6xqbYxU5uaValmKGaGax/t Received-SPF: pass client-ip=212.227.15.18; envelope-from=stephen.berman@gmx.net; helo=mout.gmx.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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:260280 Archived-At: On Fri, 4 Dec 2020 09:04:49 +0000 Alan Mackenzie wrote: > Hello, Steve. > > On Thu, Dec 03, 2020 at 23:17:18 +0100, Stephen Berman wrote: >> On Thu, 3 Dec 2020 18:15:30 +0000 Alan Mackenzie wrote: > >> > Hello, Emacs. > >> > I've got pretty much up to date copies of both the master and the >> > emacs-27 branches. > >> > When I run my customary benchmark (see below) on master's src/xdisp.c in >> > master, it's taking around 34s. On emacs-27, it's taking 22s. > >> Hm, this is odd: I just ran your benchmark on src/xdisp.c (starting >> Emacs with -Q, both configured with CFLAGS='-Og -g3') and got vastly >> different timings than you did: > >> master: 21.785817861557007 >> emacs-27: 61.3885281085968 > > Maybe the emacs-27 is built without optimisation for debugging. As noted above, I build both master and emacs-27 with CFLAGS='-Og -g3'. Given that, is such a difference still expected? Eli wrote: "In unoptimized builds I get almost no difference: Emacs 28 is about 4% slower than Emacs 27", which also contrasts sharply with my timings. Steve Berman