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 18:36:32 +0300 Message-ID: <835yvgwdxb.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="40560"; mail-complaints-to="usenet@ciao.gmane.io" Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 04 17:39:22 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 1mMXlJ-000AMR-Je for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 17:39:21 +0200 Original-Received: from localhost ([::1]:39846 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mMXlI-0008D1-70 for ged-emacs-devel@m.gmane-mx.org; Sat, 04 Sep 2021 11:39:20 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:44046) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mMXiZ-00054C-Ne for emacs-devel@gnu.org; Sat, 04 Sep 2021 11:36:31 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:34982) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mMXiY-0007iz-TD; Sat, 04 Sep 2021 11:36:31 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:2491 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 1mMXiY-000726-6R; Sat, 04 Sep 2021 11:36:30 -0400 In-Reply-To: (message from Alan Mackenzie on Sat, 4 Sep 2021 15:32:57 +0000) 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:273903 Archived-At: > Date: Sat, 4 Sep 2021 15:32:57 +0000 > From: Alan Mackenzie > Cc: Eli Zaretskii , emacs-devel@gnu.org > > > Maybe to speed things up, another option is to grow the chunk size > > a bit. > > 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. If we were to increase jit-lock-chunk-size to, say 2000, > more of the next screen would be getting fontified, perhaps wastefully. > I don't know how important this is. Maybe I should try it. > > Indeed. With jit-lock-chunk-size at 2000, time-scroll on xdisp.c takes: > > (current code): 16.4s > (new proposed code): 16.1s > > .. This speed up may well be particular to CC Mode. > > Let's try jit-lock-chunk-size at 8000: > > (current code): 15.1s > (new proposed code): 15.1s > > .. So, yes, it would seem a larger chunk size is advantageous for CC > Mode. How large (in lines and columns) is your window? The above numbers are only meaningful with the window size.