From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Processing speed in large C++ raw strings. Date: Fri, 26 Apr 2019 22:15:23 -0400 Message-ID: References: <20190425183615.GB19807@ACM> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="154534"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Apr 27 04:29:09 2019 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1hKD5Q-000e4d-E2 for ged-emacs-devel@m.gmane.org; Sat, 27 Apr 2019 04:29:08 +0200 Original-Received: from localhost ([127.0.0.1]:54517 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hKD5P-0002hk-9r for ged-emacs-devel@m.gmane.org; Fri, 26 Apr 2019 22:29:07 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:53287) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hKD4Z-0002gG-MB for emacs-devel@gnu.org; Fri, 26 Apr 2019 22:28:16 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hKCwl-0006nV-9s for emacs-devel@gnu.org; Fri, 26 Apr 2019 22:20:12 -0400 Original-Received: from [195.159.176.226] (port=47274 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hKCwh-0006bI-2b for emacs-devel@gnu.org; Fri, 26 Apr 2019 22:20:07 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.89) (envelope-from ) id 1hKCwd-000UWZ-2v for emacs-devel@gnu.org; Sat, 27 Apr 2019 04:20:03 +0200 X-Injected-Via-Gmane: http://gmane.org/ Cancel-Lock: sha1:gSf9kk0IenBi38BPJA89jreGS7A= X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 195.159.176.226 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.21 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.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.org gmane.emacs.devel:235976 Archived-At: >> I have now optimized CC Mode, such that each such self-insert-command >> now takes around 0.07s-0.1s. I used two strategies for this: (i) breaking out >> of (expensive) fontification routines early, when the region being >> fontified is nothing but a string; (ii) Not fontifying the entire raw >> string for a change to only a small part of it. > > I have been working with C++ template metaprograms for two years, and > since quite early, I have experienced CC Mode being very sluggish that > I often switch back-and-forth between cc-mode and text-mode. Could you try out the "quick hack patch" I sent in https://debbugs.gnu.org/35316 ? It has a few known bugs, so it would require further work to be really useful, but I'd be interested to know if it helps your use case. > `emacs -Q' to visit the file locally. Then, to experience the > sluggishness, I pressed M-> followed by M-v several times. FWIW, I don't expect my patch will help this use-case. Stefan