From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Gregory Heytings Newsgroups: gmane.emacs.bugs Subject: bug#56682: Fix the long lines font locking related slowdowns Date: Sun, 31 Jul 2022 22:23:19 +0000 Message-ID: <8c7321f2f3ac52bfee4b@heytings.org> References: <837d46mjen.fsf@gnu.org> <8a3eaeef01be5bfaa5ef@heytings.org> <05388e8d8812bfa3695d@heytings.org> <83v8rf5894.fsf@gnu.org> <65cb7c73fd4a999cca00@heytings.org> <8c7321f2f3400a5db9be@heytings.org> <8c7321f2f388e5343475@heytings.org> <6ea376f6-d503-06d8-6d83-50c52b695394@yandex.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="20568"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Stefan Monnier To: Dmitry Gutov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Aug 01 00:24:11 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 1oIHM2-0005B5-Oc for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Aug 2022 00:24:10 +0200 Original-Received: from localhost ([::1]:49796 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oIHM1-0008VM-8h for geb-bug-gnu-emacs@m.gmane-mx.org; Sun, 31 Jul 2022 18:24:09 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:59384) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oIHLu-0008V7-D3 for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 18:24:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:49002) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oIHLu-0007ff-4Q for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 18:24:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oIHLu-0007LD-0C for bug-gnu-emacs@gnu.org; Sun, 31 Jul 2022 18:24:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sun, 31 Jul 2022 22:24:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 56682 X-GNU-PR-Package: emacs Original-Received: via spool by 56682-submit@debbugs.gnu.org id=B56682.165930620328175 (code B ref 56682); Sun, 31 Jul 2022 22:24:01 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 31 Jul 2022 22:23:23 +0000 Original-Received: from localhost ([127.0.0.1]:38751 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oIHLG-0007KM-Q1 for submit@debbugs.gnu.org; Sun, 31 Jul 2022 18:23:23 -0400 Original-Received: from heytings.org ([95.142.160.155]:32816) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oIHLF-0007KE-1M for 56682@debbugs.gnu.org; Sun, 31 Jul 2022 18:23:22 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659306199; bh=pFus2fTKmYVxj8vCR8+aQwbjDLl9UCHHbjonsGAV+oc=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=UW89iHFg/bD3OkKUxZ5F4zfMsuH1GPWgX7w9BljuoRjBtBq1qWJCq77NzUev+RkUN gzem85XpYqJKuTr1KiSk0NNtxUJJqjLyH75L36/bqYQ7XPVI2bnFfdMN4S60sYMssL Y9nh7T6pQ7uvEdkegZOgDiXRN/6i9/0+2I/Ye9Xi4kKkdW/aoMynZ5jvAolKr+kZIW OpSrpBfTrE4dkCmPoe79mKKrMIWM6k1W8YFUsRUt/0snvEGaPFUCdhCQsUVVSH7/AT s8bQgqTSXtqTRV8GLNkkNl8xyVR4WzbQUQtuDKobUQQ4I5mjaGl6tkur7S9QOPA7E+ LKuYy0fzgHf7A== In-Reply-To: <6ea376f6-d503-06d8-6d83-50c52b695394@yandex.ru> 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" Xref: news.gmane.io gmane.emacs.bugs:238369 Archived-At: >> Yes, I wasn't clear enough, I should have written "when the file is >> large enough (say 1 GB), even without long lines". > > What kind of scenario are you thinking of that would exhibit this > slowness in a 1 GB file? > > If we're talking about syntax-ppss only, regular editing operations > (typing and deleting code) limited to, say, one screen should trigger > only a rescan of a limited area inside such buffer. > That's true, but with such big files, the initial scan is slow. So the scenario is simple: you open a big enough file, type M->, and C-p. M-> will be instantaneous, and C-p will take a while, because of syntax-ppss.