From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: "Basil L. Contovounesios" Newsgroups: gmane.emacs.devel Subject: Re: The Emacs master is much slower than the emacs-27 branch. Date: Sat, 05 Dec 2020 13:50:51 +0000 Message-ID: <87wnxwuzt0.fsf@tcd.ie> References: <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> <83360le421.fsf@gnu.org> <83y2idcn8q.fsf@gnu.org> <83wnxxcmjr.fsf@gnu.org> <83tut0d7e9.fsf@gnu.org> <83h7p0d37y.fsf@gnu.org> <83ft4kd2ym.fsf@gnu.org> <83eek4d2co.fsf@gnu.org> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="=-=-=" Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="2398"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: ghe@sdf.org, acm@muc.de, stephen.berman@gmx.net, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Dec 05 14:52:14 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 1klXyw-0000WR-46 for ged-emacs-devel@m.gmane-mx.org; Sat, 05 Dec 2020 14:52:14 +0100 Original-Received: from localhost ([::1]:49420 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1klXyv-0001BD-4V for ged-emacs-devel@m.gmane-mx.org; Sat, 05 Dec 2020 08:52:13 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:46148) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1klXxk-0000kl-C0 for emacs-devel@gnu.org; Sat, 05 Dec 2020 08:51:00 -0500 Original-Received: from mail-wm1-x32e.google.com ([2a00:1450:4864:20::32e]:35741) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1klXxi-0001Q7-7c for emacs-devel@gnu.org; Sat, 05 Dec 2020 08:51:00 -0500 Original-Received: by mail-wm1-x32e.google.com with SMTP id e25so9508820wme.0 for ; Sat, 05 Dec 2020 05:50:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tcd-ie.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=Zpj13Bb5i62gaH2muW/FBsV6OkHfEWQP3+5vqj3UATE=; b=kguJmPAhTfjJdmHyCtrp7ckKQFooSz8wZk6pGoT0d95XBpQi3JQmOFjAf7ySJkfk4I xTtUf5pNTXxfffI38lXtIX9MVyHb8Ee70aN6SpgT98npTjasQrpM61eW+fynOQFQOXiV DABRNkCTbhVa72SvrbNtsiOYpD4a4TF9hgB/Gc7HvW95DOQHTLeMW0ydsOf3CTCvZseM zKnnfRg8f2gTmDvQE4FojnvPrXyi2PQnzHw19TutZkSWwLuj+FSXuk5Hao7BvBWEPgwa vIvYMBson/7nvYwDpu41CJOYuKM4szpVrtFIOGSNsV64eJBkZQOjgvHod0CWn8v6Pbue y1FQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=Zpj13Bb5i62gaH2muW/FBsV6OkHfEWQP3+5vqj3UATE=; b=WmZJZ5JaXAwoY8zD4oJtEKQ7P6uOlxgpZmVFmUQG/zKqqnqrcGjsQmQ47dF7Juisfh e0tRMTVPgGg9jhJu1Yo82eoBQwZ2twAD9H2yGJq7Lj5CwI4Bha8YyFSch+Kn/D0beTjj d4tw2kPunjxrj0W1tlPGNNWSXT1nm79NC+85YgbF3GoavKXknipSzXwDUKMCg50CdQUx l/ExCCT3sxTpbqRs2j1YhOjFWoRSzveZkbdQUAbvurl7gw1iHXv05rMZ1jt010QEQwFB ibFXPXepXHvLmO21IZOA5cI009eBGOs0PphIOX+4PJ+rEhM7lBCi6Wj7JecYvuH22tb2 H8nQ== X-Gm-Message-State: AOAM530WExoqigOvTj1L8979Zrr0BlJSNN2xM2crzHJCfewYiy1cI1TZ zkeNdwqdL2dbDWYU9fGPeBLZsQ== X-Google-Smtp-Source: ABdhPJwZbgsdaUsVxrIkcesBJRpK3DGu08GRFLO7PpW5qfhh1lPPoJVKi3BIwRhTKTa7w8jfai4jKQ== X-Received: by 2002:a1c:61c3:: with SMTP id v186mr9394232wmb.146.1607176253743; Sat, 05 Dec 2020 05:50:53 -0800 (PST) Original-Received: from localhost ([51.37.47.98]) by smtp.gmail.com with ESMTPSA id x5sm7675265wrm.96.2020.12.05.05.50.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 05 Dec 2020 05:50:52 -0800 (PST) In-Reply-To: <83eek4d2co.fsf@gnu.org> (Eli Zaretskii's message of "Sat, 05 Dec 2020 11:33:11 +0200") Received-SPF: none client-ip=2a00:1450:4864:20::32e; envelope-from=contovob@tcd.ie; helo=mail-wm1-x32e.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=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:260356 Archived-At: --=-=-= Content-Type: text/plain Eli Zaretskii writes: > In any case, Alan's original report was for optimized builds, and he > observed (although was later unable to reproduce) that Emacs 28 was > slower than Emacs 27. So the important part of this is to compare the > performance of the optimized (-O2) builds and see if we have any > degradation in Emacs 28 in that case. Given the following file /tmp/timeit.el based on Alan's benchmark: --=-=-= Content-Type: application/emacs-lisp Content-Disposition: inline; filename=timeit.el Content-Transfer-Encoding: quoted-printable ;; -*- lexical-binding: t -*- (defmacro time-it (&rest forms) "Return seconds taken to evaluate FORMS." `(let ((start (current-time))) ,@forms (float-time (time-subtract nil start)))) (defun time-scroll (&optional arg) (interactive "P") (with-temp-buffer (insert (number-to-string (time-it (ignore-errors (while t (if arg (scroll-down) (scroll-up)) (sit-for 0))))) ?\n) (let ((file (format "/tmp/timings-%d.txt" emacs-major-version))) (write-region nil nil file t 0))) (kill-emacs)) ;; Always use same version. (find-file "~/.local/src/emacs/src/xdisp.c") (run-at-time 2 nil #'time-scroll) --=-=-= Content-Type: text/plain Byte-compile it: $ emacs -Q -batch -f batch-byte-compile /tmp/timeit.el Load it with each Emacs build four times: $ for i in {0..3}; do ./src/emacs -Q -l /tmp/timeit.elc; done Calculate mean timings: $ for t in /tmp/timings*.txt; do awk '{s+=$1}END{print FILENAME,s/NR}' "$t"; done /tmp/timings-27.txt 28.3246 /tmp/timings-28.txt 31.7968 Emacs 27 build info: In GNU Emacs 27.1.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw3d scroll bars) of 2020-12-05 built on thunk Repository revision: 6916e7954ab5de5e2dc7b25f165a63396d0e70a0 Repository branch: emacs-27 Windowing system distributor 'The X.Org Foundation', version 11.0.12008000 System Description: Debian GNU/Linux bullseye/sid Configured using: 'configure 'CC=ccache gcc' 'CFLAGS=-O2 -march=native' --prefix=/home/blc/.local --program-suffix=27-opt --with-x-toolkit=lucid --with-file-notification=yes --with-x --with-cairo' Configured features: XAW3D XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON PDUMPER LCMS2 GMP Emacs 28 build info: In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw3d scroll bars) of 2020-12-05 built on thunk Repository revision: dc39c66d3bb6b1db6af0519659ff154bf6d8a5d1 Repository branch: master Windowing system distributor 'The X.Org Foundation', version 11.0.12008000 System Description: Debian GNU/Linux bullseye/sid Configured using: 'configure 'CC=ccache gcc' 'CFLAGS=-O2 -march=native' --config-cache --prefix=/home/blc/.local --with-x-toolkit=lucid --with-file-notification=yes --with-x' Configured features: XAW3D XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD JSON PDUMPER LCMS2 Other info: value of $LANG: en_IE.UTF-8 value of $XMODIFIERS: @im=ibus locale-coding-system: utf-8-unix $ grep 'model name' /proc/cpuinfo | awk -F: 'NR==1{print $2}' Intel(R) Core(TM) i5-3230M CPU @ 2.60GHz $ grep -c 'model name' /proc/cpuinfo 4 $ gcc --version gcc (Debian 10.2.0-19) 10.2.0 $ uname -a Linux thunk 5.9.0-4-amd64 #1 SMP Debian 5.9.11-1 (2020-11-27) x86_64 GNU/Linux HTH, -- Basil --=-=-=--