From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Alan Mackenzie Newsgroups: gmane.emacs.devel Subject: Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7% Date: Sat, 18 Sep 2021 11:37:32 +0000 Message-ID: References: <835yvgwdxb.fsf@gnu.org> <8335qkwddv.fsf@gnu.org> <83wnnwuxkj.fsf@gnu.org> <838s0armbl.fsf@gnu.org> <83a6kpqzje.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="40090"; mail-complaints-to="usenet@ciao.gmane.io" Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Eli Zaretskii Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Sep 18 13:39:44 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 1mRYh6-000ABZ-9N for ged-emacs-devel@m.gmane-mx.org; Sat, 18 Sep 2021 13:39:44 +0200 Original-Received: from localhost ([::1]:59692 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mRYh4-0006Lo-CY for ged-emacs-devel@m.gmane-mx.org; Sat, 18 Sep 2021 07:39:42 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:56530) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mRYf5-0005X1-8e for emacs-devel@gnu.org; Sat, 18 Sep 2021 07:37:39 -0400 Original-Received: from colin.muc.de ([193.149.48.1]:28781 helo=mail.muc.de) by eggs.gnu.org with smtp (Exim 4.90_1) (envelope-from ) id 1mRYf1-0001b9-SV for emacs-devel@gnu.org; Sat, 18 Sep 2021 07:37:39 -0400 Original-Received: (qmail 65274 invoked by uid 3782); 18 Sep 2021 11:37:33 -0000 Original-Received: from acm.muc.de (p2e5d52d9.dip0.t-ipconnect.de [46.93.82.217]) (using STARTTLS) by colin.muc.de (tmda-ofmipd) with ESMTP; Sat, 18 Sep 2021 13:37:32 +0200 Original-Received: (qmail 5280 invoked by uid 1000); 18 Sep 2021 11:37:32 -0000 Content-Disposition: inline In-Reply-To: <83a6kpqzje.fsf@gnu.org> X-Submission-Agent: TMDA/1.3.x (Ph3nix) X-Primary-Address: acm@muc.de Received-SPF: pass client-ip=193.149.48.1; envelope-from=acm@muc.de; helo=mail.muc.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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:274985 Archived-At: Hello, Eli. On Mon, Sep 06, 2021 at 22:23:01 +0300, Eli Zaretskii wrote: > > Date: Mon, 6 Sep 2021 19:08:45 +0000 > > Cc: monnier@iro.umontreal.ca, emacs-devel@gnu.org > > From: Alan Mackenzie > > (It is notable that redisplay is quite a bit slower in X at 54 lines > > than on a Linux console at 65 lines.) > That's expected: TTY display skips some stuff that is only needed on > GUI frames, so it's faster. > > So, based on these timings, I would suggest a new jit-lock-chunk-size of > > 1500. > Agreed. Please be sure to include a reference to this message in the > commit log message, when you install the change. > Thanks. Just as a postscript, the 7% speed advantage from reworked jit code we were talking about has largely disappeared with the increase in jit-chunk-size from 500 to 1500. The speed advantage is now around 1% - 2%, almost, but not quite, lost in the noise. I therefore propose not installing any of these changes for Emacs-28. I don't think the slight speed increase would justify the increased complexity. -- Alan Mackenzie (Nuremberg, Germany).