From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii 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 20:15:25 +0300 Message-ID: <83sfm6veqa.fsf@gnu.org> References: <835yj4xhh7.fsf@gnu.org> <83y1w0w0gk.fsf@gnu.org> <83pmhcvugm.fsf@gnu.org> <83czdbwjfr.fsf@gnu.org> <837d3jvu9f.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="1854"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 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 19:27:40 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 1oL6XU-0000JL-9r for ged-emacs-devel@m.gmane-mx.org; Mon, 08 Aug 2022 19:27:40 +0200 Original-Received: from localhost ([::1]:33504 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1oL6XT-0003iy-6H for ged-emacs-devel@m.gmane-mx.org; Mon, 08 Aug 2022 13:27:39 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:60642) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oL6Lt-0001of-5j for emacs-devel@gnu.org; Mon, 08 Aug 2022 13:15:41 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:47828) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oL6Lq-0003rh-PV; Mon, 08 Aug 2022 13:15:40 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=Gvxt4PUSRtK+YLSq9bR3cNb1xvsP9kT2YfQ5s3DFCn0=; b=mFrjpJW3JuGd 1BzMShMqPQQSOzbr0Ivk1w7Sxa29iQzTMdzHW1yVX4Wt6g1wdoE6nmdwF7xFIQW572gSMRbUFMRQ3 B03pdYlnp+aGl44Kotr8q4e4Y40XBjw6altxBOEg/IRFMC3Eu6A/HhRN00i6lW0ZlVXeE10wQ57PX G0PnXWY5SlmJKaV5V3QxCtT6p2p0haE4rYrc2ZjfHbx71plHvnBogiTcF9gsR8rNNH2awJMUNF7tp EZ4AlBfPyaGAaewxVa/sGUU1U3+Mwg9vbCV5JuxQhbzK++lGUwlGH4qE7lguOX/dcJXdVJ+ZtMqCE 3cjdbFlXLYZOVgDV3cDv1A==; Original-Received: from [87.69.77.57] (port=3662 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1oL6Lq-0005xH-8i; Mon, 08 Aug 2022 13:15:38 -0400 In-Reply-To: (message from Alan Mackenzie on Mon, 8 Aug 2022 15:05:29 +0000) 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:293276 Archived-At: > Date: Mon, 8 Aug 2022 15:05:29 +0000 > Cc: emacs-devel@gnu.org > From: Alan Mackenzie > > For this measurement, I started with subr.el, and appended copies of it > to itself, then took functions off the end, to make it the same size as > xdisp.c. xdisp.c is 1209233 bytes, my .el buffer was 1209371 bytes. > > I used M-: (benchmark-run 1 (time-scroll-b)) on each buffer, with: > > (defun time-scroll-b (&optional arg) ; For use in `benchmark-run'. > (condition-case nil > (while t > (if arg (scroll-down) (scroll-up)) > (sit-for 0)) > (error nil))) > > .. The exact results were: > (xdisp.c): (5.7370774540000005 9 0.7672129740000013) > (elisp): (4.1201735589999995 5 0.42918214299999846). > > This was, of course, on an optimised build on GNU/Linux using the Linux > console, both measurements starting at BOB, having typed and deleted a > character to erase existing font-locking. Editing source code is more than just scrolling through the text and getting it fontified, though. For realistic measurements, you need to emulate and time a typical mix of editing operations.