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.devel Subject: Re: CC Mode with font-lock-maximum-decoration 2 [Was Major modes using `widen' is a good, even essential, programming practice.] Date: Mon, 08 Aug 2022 15:51:50 +0000 Message-ID: <5e6d30abc39860ef5e37@heytings.org> References: <835yj4xhh7.fsf@gnu.org> <83y1w0w0gk.fsf@gnu.org> <83pmhcvugm.fsf@gnu.org> <83czdbwjfr.fsf@gnu.org> <837d3jvu9f.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; format=flowed; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="7609"; mail-complaints-to="usenet@ciao.gmane.io" Cc: Eli Zaretskii , emacs-devel@gnu.org To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Mon Aug 08 17:52:54 2022 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 1oL53k-0001la-QQ for ged-emacs-devel@m.gmane-mx.org; Mon, 08 Aug 2022 17:52:53 +0200 Original-Received: from localhost ([::1]:56202 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oL53j-000643-S3 for ged-emacs-devel@m.gmane-mx.org; Mon, 08 Aug 2022 11:52:51 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:42644) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oL52q-00042e-4D for emacs-devel@gnu.org; Mon, 08 Aug 2022 11:51:56 -0400 Original-Received: from heytings.org ([95.142.160.155]:42852) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oL52o-0007gP-I2; Mon, 08 Aug 2022 11:51:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=heytings.org; s=20220101; t=1659973910; bh=QNxGQuERH6/M2EQXhSvs9UCpTGGDstEkjKRyaeT7hrk=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References:From; b=3Lb5ZJZiPd1DOOaEQhatc32RXBno+9HPKLpz8SUGiMe42F4HMCEJrzJbRELfP9wjU PlkuaJx391k3lOnI/NYwFekDMZ7AI7C+PkseQT3UcoxHS0/Fx3kuGhWMKKC/MQZ86u Jj7idvjrL54mvm500bHczCvIWNAWi0/UYH2ENnitAoNPQzPale1CUx9mqKMJDnaZ2R Bt4ir1/ViuXzpLL7r37PBdES9qFmRHmmQJOhCwdvpomNVZZUwiM/lJbXXnT0UjDZTn vh1gxe8BxeiWQwCtO2Tf4Yl5ReG3ebJkKDSqoFQQxHKAEQTe/AN+wfqlCpa115v7Sf abky3uzX6gbGQ== In-Reply-To: Received-SPF: pass client-ip=95.142.160.155; envelope-from=gregory@heytings.org; helo=heytings.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.29 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:293272 Archived-At: > > I've just measured the font-locking time, and (let's call it) CC Mode/2 > fontifies at 72% the speed of Emacs Lisp Mode. > I don't know under which exact conditions you obtained these (very favorable) numbers, but I at least cannot reproduce them. Here are two ways to measure the relative speed of fontification in Emacs Lisp and C. First create a "complex.el" file with for i in $(seq 1 3); do cat lisp/simple.el; done > complex.el (Note that the resulting complex.el file is slightly larger than xdisp.c.) Then: 1. Use your (benchmark-run 1 (time-scroll)) after loading complex.el and xdisp.c in emacs -Q. The numbers here are 4.5 seconds for complex.el and 20.5 seconds for xdisp.c. More than four times slower. 2. Use (benchmark-run 1 (font-lock-fontify-region (point-min) (point-max)) after loading complex.el and xdisp.c in emacs -Q. The numbers here are 1.2 seconds for complex.el and 12.5 seconds for xdisp.el. More than ten times slower.