From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.bugs Subject: bug#59738: c-ts-mode is slow with large buffers. Date: Thu, 1 Dec 2022 11:50:05 +0000 Message-ID: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="24988"; mail-complaints-to="usenet@ciao.gmane.io" To: 59738@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Thu Dec 01 12:51:30 2022 Return-path: Envelope-to: geb-bug-gnu-emacs@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 1p0i6E-0006FF-Jr for geb-bug-gnu-emacs@m.gmane-mx.org; Thu, 01 Dec 2022 12:51:30 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p0i5q-0006Je-89; Thu, 01 Dec 2022 06:51:06 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p0i5n-0006JL-On for bug-gnu-emacs@gnu.org; Thu, 01 Dec 2022 06:51:04 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1p0i5n-0003nZ-2G for bug-gnu-emacs@gnu.org; Thu, 01 Dec 2022 06:51:03 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1p0i5m-0008Kt-CL for bug-gnu-emacs@gnu.org; Thu, 01 Dec 2022 06:51:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Alan Mackenzie Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 01 Dec 2022 11:51:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: report 59738 X-GNU-PR-Package: emacs X-Debbugs-Original-To: bug-gnu-emacs@gnu.org Original-Received: via spool by submit@debbugs.gnu.org id=B.166989543132034 (code B ref -1); Thu, 01 Dec 2022 11:51:02 +0000 Original-Received: (at submit) by debbugs.gnu.org; 1 Dec 2022 11:50:31 +0000 Original-Received: from localhost ([127.0.0.1]:39253 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1p0i5G-0008Kc-Lm for submit@debbugs.gnu.org; Thu, 01 Dec 2022 06:50:30 -0500 Original-Received: from lists.gnu.org ([209.51.188.17]:33252) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1p0i5D-0008KW-Pf for submit@debbugs.gnu.org; Thu, 01 Dec 2022 06:50:29 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p0i5B-0006Aa-Bc for bug-gnu-emacs@gnu.org; Thu, 01 Dec 2022 06:50:27 -0500 Original-Received: from mx3.muc.de ([193.149.48.5]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p0i59-0003Op-10 for bug-gnu-emacs@gnu.org; Thu, 01 Dec 2022 06:50:25 -0500 Original-Received: (qmail 1930 invoked by uid 3782); 1 Dec 2022 12:50:06 +0100 Original-Received: from acm.muc.de (p4fe158f4.dip0.t-ipconnect.de [79.225.88.244]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Thu, 01 Dec 2022 12:50:06 +0100 Original-Received: (qmail 17277 invoked by uid 1000); 1 Dec 2022 11:50:05 -0000 Content-Disposition: inline X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.5; envelope-from=acm@muc.de; helo=mx3.muc.de 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, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:249625 Archived-At: Hello, Emacs. In an up to date (2022-11-30) master started as $ emacs --no-desktop: The file .../drivers/gpu/drm/amd/include/asic_reg/dce/dce_12_0_sh_mask.h in the Linux source tree is 6.8 MB big, consisting of a large number of #defines and comments, but nothing else. To scroll through it in c-ts-mode takes a little over 26 minutes on my system. By comparison, in C Mode it takes 31 seconds. There would appear to be a need for some optimisation in c-ts-mode, here. The file https://gitlab.com/wireshark/wireshark/-/raw/master/epan/dissectors/packet-rrc.c (see bug #45248) (10 MB) takes 578 seconds to scroll in c-ts-mode. It scrolls through the first 83% of the buffer rapidly, then chokes on a big brace block initialisation. Also, the font-locking fails part way through this brace block (without any apparent speed up). For comparison, the scrolling takes 30 seconds in C Mode. There seems to be a need for optimisation of c-ts-mode in this case, too. For completeness, I used M-: (time-scroll) in the following for the timings: (defmacro time-it (&rest forms) "Time the running of a sequence of forms using `float-time'. Call like this: \"M-: (time-it (foo ...) (bar ...) ...)\"." `(let ((start (float-time))) ,@forms (- (float-time) start))) (defun time-scroll (&optional arg) (interactive "P") (message "%s" (time-it (condition-case nil (while t (if arg (scroll-down) (scroll-up)) (sit-for 0)) (error nil))))) -- Alan Mackenzie (Nuremberg, Germany).