From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: Overlays as an AA-tree Date: Mon, 13 Feb 2017 08:11:00 +0200 Message-ID: <83k28u1uyz.fsf@gnu.org> References: <87d1jylv43.fsf@fastmail.com> <87fujv64mn.fsf@hochschule-trier.de> <87fujvpkzc.fsf@fastmail.com> <87vasr5tqd.fsf@hochschule-trier.de> <87d1ex4kon.fsf@hochschule-trier.de> <87d1evod6x.fsf@fastmail.com> <877f53ftab.fsf@hochschule-trier.de> <878tpiqiuc.fsf@hochschule-trier.de> <87shnppspb.fsf@hochschule-trier.de> <87o9yc9v30.fsf@hochschule-trier.de> <87a89vaes3.fsf@hochschule-trier.de> <87efz7n0g5.fsf@fastmail.com> <877f4uah6i.fsf@hochschule-trier.de> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1486966446 16274 195.159.176.226 (13 Feb 2017 06:14:06 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 13 Feb 2017 06:14:06 +0000 (UTC) Cc: emacs-devel@gnu.org To: Andreas Politz Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Feb 13 07:14:02 2017 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 1cd9tf-0003lf-Do for ged-emacs-devel@m.gmane.org; Mon, 13 Feb 2017 07:13:59 +0100 Original-Received: from localhost ([::1]:54738 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cd9tk-00005L-V6 for ged-emacs-devel@m.gmane.org; Mon, 13 Feb 2017 01:14:04 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:34991) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cd9qa-00068a-6g for emacs-devel@gnu.org; Mon, 13 Feb 2017 01:10:49 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cd9qX-0003Om-1L for emacs-devel@gnu.org; Mon, 13 Feb 2017 01:10:48 -0500 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:54353) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cd9qW-0003Oi-UX; Mon, 13 Feb 2017 01:10:44 -0500 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:4938 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1cd9qW-00031K-3S; Mon, 13 Feb 2017 01:10:44 -0500 In-reply-to: <877f4uah6i.fsf@hochschule-trier.de> (message from Andreas Politz on Mon, 13 Feb 2017 04:44:05 +0100) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2001:4830:134:3::e 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:212323 Archived-At: > From: Andreas Politz > Date: Mon, 13 Feb 2017 04:44:05 +0100 > > I've been working on this thing and below are my preliminary > findings, so to speak. The code can be found here [1]. There is a > file etc/noverlay.org in there, containing some notes and pointing to > some other files. > > I developed some performance tests, which for the most part are very > bare-bones and test single functions only in a constrained environment. > Following are some numbers, a description of the test-functions and an > attempt to make sense of the results. Thank you for working on this important issue. >From my POV, a very important performance issue is that of redisplay. So I'd like to see a performance comparison in at least three use cases: . scrolling through a buffer with lots of overlays that affect faces of characters in the buffer text . scrolling through a buffer with lots of overlays that define 'display' properties which are strings . scrolling through a buffer with lots of overlays that define 'invisible' properties Bonus points for having multiple overlays with different priorities at the same buffer positions. > The final test seems to indicate that redisplay has an effect on this, > probably due to the fact that it in some cases recenters the lists. The display engine always recenters overlays around the line of text it is rendering. See, e.g., display_line in xdisp.c. Thanks.