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: Mon, 01 Aug 2022 11:23:52 +0000 Message-ID: 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> <8c7321f2f3ac52bfee4b@heytings.org> <8c7321f2f3ec1ef81af9@heytings.org> 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="3762"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 56682@debbugs.gnu.org, Eli Zaretskii , Dmitry Gutov To: Stefan Monnier Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Aug 01 13:24:12 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 1oITWu-0000ng-LL for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Aug 2022 13:24:12 +0200 Original-Received: from localhost ([::1]:48152 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oITWt-0001oL-DQ for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 01 Aug 2022 07:24:11 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:33244) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oITWk-0001oA-Ag for bug-gnu-emacs@gnu.org; Mon, 01 Aug 2022 07:24:02 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:49730) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1oITWj-0004ym-VQ for bug-gnu-emacs@gnu.org; Mon, 01 Aug 2022 07:24:01 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1oITWj-0006Du-Hm for bug-gnu-emacs@gnu.org; Mon, 01 Aug 2022 07:24:01 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Gregory Heytings Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 01 Aug 2022 11:24:01 +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=B56682.165935303623907 (code B ref 56682); Mon, 01 Aug 2022 11:24:01 +0000 Original-Received: (at 56682) by debbugs.gnu.org; 1 Aug 2022 11:23:56 +0000 Original-Received: from localhost ([127.0.0.1]:39479 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oITWe-0006DX-HO for submit@debbugs.gnu.org; Mon, 01 Aug 2022 07:23:56 -0400 Original-Received: from heytings.org ([95.142.160.155]:33634) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1oITWc-0006DP-QI for 56682@debbugs.gnu.org; Mon, 01 Aug 2022 07:23:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659353033; bh=/6qOaiAyPnT9yzaEcec40jbmVAgMS6RjR99VQ7ebF4Y=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=9lNfnwlIjvrA5S+uVyCg+BY9GtcydLO2fVOsS2BCsP3msUuxb/iyttqD8uOQpT/gK NzHH+RHqXa9QpfAK9m1ZWWA6/SjIUAjkl+AeNUMndYUmC3DGJ/Kc0BIN+UF4b0z1rN 2dr+ISobpDL5ZLTDnUNKcYhlvlT9G+PLznp6qCZhU4u035bKjbjxq/BqYc7+hh/av2 5Ki4tsDvdThb+CH9EWJw7JA21ZV4D1aLJo0QDDy9uQ3tnYsqPBjUaAq8YH7VSOBXfV x69VRBzjo9I/JSACOpoCC3dJXaqWEE94ooi8JaPXg2I7706VvwFU2cQtNabwQYUvRn wwbGPWlZ4vy/w== In-Reply-To: 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:238408 Archived-At: >> The problem is that this is, as I said, slow. On my laptop, opening a >> 1 GB file takes about 6 seconds. The call to syntax-ppss adds 70 >> seconds, so opening a large file becomes an order of magnitude slower >> (13 times slower). > > It's meaningless to talk about the time taken by `syntax-ppss` without > specifying the major mode that was in use. > It isn't. The benchmark above was with a JSON file (js-mode), but you'll see the same ratio with an Elisp file for example: for I in $(seq 1 2500); do cat lisp/simple.el; done > complex.el That file opens in about 5 seconds, and (benchmark-run 1 (syntax-ppss (point-max))) takes about 45 seconds. Sure, there are perhaps modes that are slower, but my tests seem to indicate that the 1/10 ratio is correct, or IOW that syntax-ppss is an order of magnitude slower than opening the file. > > You might also want to compare to the time to run > > (parse-partial-sexp (point-min) (point-max)) > > which is a kind of "speed of light" for `syntax-ppss`. > What do you mean? With the above file (benchmark-run 1 (parse-partial-sexp (point-min) (point-max))) takes 55 seconds.