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 16:36:09 +0200 Message-ID: <83inoe17l2.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> <83k28u1uyz.fsf@gnu.org> <87zihq8nsi.fsf@hochschule-trier.de> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1486997547 15799 195.159.176.226 (13 Feb 2017 14:52:27 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 13 Feb 2017 14:52:27 +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 15:52:24 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 1cdHzH-0003dk-Qs for ged-emacs-devel@m.gmane.org; Mon, 13 Feb 2017 15:52:19 +0100 Original-Received: from localhost ([::1]:57371 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cdHzN-0004C2-GS for ged-emacs-devel@m.gmane.org; Mon, 13 Feb 2017 09:52:25 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:35558) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cdHjP-0006Ud-VI for emacs-devel@gnu.org; Mon, 13 Feb 2017 09:35:58 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cdHjN-0007Ye-Cl for emacs-devel@gnu.org; Mon, 13 Feb 2017 09:35:56 -0500 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:59682) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cdHjN-0007Ya-9X; Mon, 13 Feb 2017 09:35:53 -0500 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:1527 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1cdHjM-0004r3-IA; Mon, 13 Feb 2017 09:35:53 -0500 In-reply-to: <87zihq8nsi.fsf@hochschule-trier.de> (message from Andreas Politz on Mon, 13 Feb 2017 10:04:13 +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:212336 Archived-At: > From: Andreas Politz > Cc: emacs-devel@gnu.org > Date: Mon, 13 Feb 2017 10:04:13 +0100 > > Eli Zaretskii writes: > > >> From: Andreas Politz > > Thank you for working on this important issue. > > I enjoyed it. I'm sure we will, too. > > From my POV, a very important performance issue is that of redisplay. > > Do you expect redisplay performance to improve or is it your aim that it > does not degrade ? It should certainly not be worse, otherwise the design and implementation would need to be improved, IMO. Display is a very important client of overlays, so it shouldn't suffer from refactoring. I would be happy to know that performance gets better, of course. The recentering of overlays, which is not a cheap operation, should no longer be needed, for example. > BTW how do you figure out which functions need attention, > performance-wise. If you mean overlay-specific functions, I can name the most important ones for you. I know which ones they are because I know what the display engine calls in its inner loops. > Is there any experience using valgrind/callgrind, because I tried it > and the results seem bogus to me, but I may be mistaken. Using valgrind/callgrind with Emacs needs some special techniques, some of them are described in etc/DEBUG. I think the most important trick is to measure temacs, not a dumped emacs binary.