From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: Performance degradation from long lines Date: Wed, 24 Oct 2018 20:27:10 -0400 Message-ID: References: NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1540427140 14895 195.159.176.226 (25 Oct 2018 00:25:40 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 25 Oct 2018 00:25:40 +0000 (UTC) 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 Thu Oct 25 02:25:36 2018 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gFTSx-0003nG-Le for ged-emacs-devel@m.gmane.org; Thu, 25 Oct 2018 02:25:35 +0200 Original-Received: from localhost ([::1]:51305 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gFTV3-0001HD-Qf for ged-emacs-devel@m.gmane.org; Wed, 24 Oct 2018 20:27:45 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:52704) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gFTUx-0001AV-ST for emacs-devel@gnu.org; Wed, 24 Oct 2018 20:27:40 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gFTUs-00030l-3Y for emacs-devel@gnu.org; Wed, 24 Oct 2018 20:27:37 -0400 Original-Received: from [195.159.176.226] (port=45411 helo=blaine.gmane.org) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1gFTUl-0002wl-Ep for emacs-devel@gnu.org; Wed, 24 Oct 2018 20:27:30 -0400 Original-Received: from list by blaine.gmane.org with local (Exim 4.84_2) (envelope-from ) id 1gFTSV-0003JE-KF for emacs-devel@gnu.org; Thu, 25 Oct 2018 02:25:07 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 27 Original-X-Complaints-To: usenet@blaine.gmane.org Cancel-Lock: sha1:gxFeXfkski8ePQnD+cbJyfMhOHY= 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:230649 Archived-At: > In summary, it seems that it might be possible to significantly > improve performance by altering Emacs' display engine to use simpler > techniques at cost of increased maintenance for the extra code that > will be needed, and the loss of some display capability. > I encourage reading the original thread for details. I think it would be worthwhile to have a specific minor mode we can enable for those cases. > In the case of gui Emacs, the reduction of display capability is real, > but it seems prefereable to freezing Emacs or slowing it down to a crawl. AFAIK there are *several* unrelated features that can cause very serious slow downs in the presence of long lines. So we need to attack them one by one. A dedicated minor mode would be a good place to accumulate the workarounds. > I had three other ideas, which I did not yet have a chance to mention > in the thread. These seem to concentrate on trying to detect the slow case and partly reduce its impact. So, they're largely orthogonal. I don't expect that make-thread would make a noticeable difference, but auto-detction of performance problems might be helpful. Stefan