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, 20 Feb 2017 17:34:15 +0200 Message-ID: <838tp0q3k8.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> <871suxs9ad.fsf@hochschule-trier.de> <837f4pxpdc.fsf@gnu.org> <877f4lls9e.fsf@hochschule-trier.de> Reply-To: Eli Zaretskii NNTP-Posting-Host: blaine.gmane.org X-Trace: blaine.gmane.org 1487605687 13826 195.159.176.226 (20 Feb 2017 15:48:07 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 20 Feb 2017 15:48:07 +0000 (UTC) Cc: joakim.jalap@fastmail.com, monnier@iro.umontreal.ca, emacs-devel@gnu.org To: Andreas Politz Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Mon Feb 20 16:48:02 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 1cfqC0-0002pD-BI for ged-emacs-devel@m.gmane.org; Mon, 20 Feb 2017 16:48:00 +0100 Original-Received: from localhost ([::1]:39326 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cfqC6-0007uE-7i for ged-emacs-devel@m.gmane.org; Mon, 20 Feb 2017 10:48:06 -0500 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:39290) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cfpyQ-0004Sz-C3 for emacs-devel@gnu.org; Mon, 20 Feb 2017 10:33:59 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cfpyP-0002e7-DF for emacs-devel@gnu.org; Mon, 20 Feb 2017 10:33:58 -0500 Original-Received: from fencepost.gnu.org ([2001:4830:134:3::e]:47820) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cfpy8-0002XY-Gl; Mon, 20 Feb 2017 10:33:40 -0500 Original-Received: from 84.94.185.246.cable.012.net.il ([84.94.185.246]:4791 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1cfpy7-0007Wt-Lb; Mon, 20 Feb 2017 10:33:40 -0500 In-reply-to: <877f4lls9e.fsf@hochschule-trier.de> (message from Andreas Politz on Sun, 19 Feb 2017 23:39:41 +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:212488 Archived-At: > From: Andreas Politz > Cc: emacs-devel@gnu.org, Stefan Monnier , Joakim Jalap > Date: Sun, 19 Feb 2017 23:39:41 +0100 > > Here is one such case were the tree is forced to search through all > overlays in order to find the next change: > > |--------------------------| > |-------------------| > |-------------| > B ^ E > P > > We are looking for the next change after P, which is E. But E is the > end of some overlay, and the tree knows nothing about the order of > these, so it needs to consider all overlays. Here are some numbers; > > +------------------------+-----+------+ > |2500 overlays |tree |list | > +------------------------+-----+------+ > |sequential/face/scroll |1.28 |1.32 | > +------------------------+-----+------+ > |hierarchical/face/scroll|76.59|174.64| > +------------------------+-----+------+ The new implementation is still faster than the old one, so perhaps you shouldn't bother too much? Or am I missing something?