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: bug-reference-prog-mode slows down CC Mode's scrolling by ~7% Date: Sat, 04 Sep 2021 19:23:17 +0300 Message-ID: <83tuj0ux6y.fsf@gnu.org> References: <83a6kuyysv.fsf@gnu.org> <837dfwyird.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8879"; mail-complaints-to="usenet@ciao.gmane.io" Cc: acm@muc.de, emacs-devel@gnu.org To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 04 18:24:09 2021 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 1mMYSf-000241-49 for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 18:24:09 +0200 Original-Received: from localhost ([::1]:58220 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mMYSd-00017G-R8 for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 12:24:07 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:52566) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mMYRo-0000O4-CS for emacs-devel@gnu.org; Sat, 04 Sep 2021 12:23:16 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:37038) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mMYRn-0005xx-P0; Sat, 04 Sep 2021 12:23:15 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:1423 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 1mMYRn-0006CU-BI; Sat, 04 Sep 2021 12:23:15 -0400 In-Reply-To: (message from Stefan Monnier on Sat, 04 Sep 2021 12:06:44 -0400) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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:273924 Archived-At: > From: Stefan Monnier > Cc: Eli Zaretskii , emacs-devel@gnu.org > Date: Sat, 04 Sep 2021 12:06:44 -0400 > > > Maybe. An advantage of a small chunk size is that fontifying a single > > screen can be done with a maximum 499 bytes "inefficiency" off the end > > of a screen. > > [ Well, 499 plus the effect of increasing the specified region by > rounding it up to whole lines and things like that, of course ;-) ] > > > If we were to increase jit-lock-chunk-size to, say 2000, more of the > > next screen would be getting fontified, perhaps wastefully. > > Indeed, I was thinking of increasing it only to 1000. To see the "waste" in single-windowful scrolls, we need a suitable benchmark, which measures the time of each scroll separately. It would probably make sense to make it generate a random value of point, then measure the time it takes to go there and display.