From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Juri Linkov Newsgroups: gmane.emacs.devel Subject: Re: very slow archive-mode Date: Thu, 13 Mar 2008 00:41:14 +0200 Organization: JURTA Message-ID: <874pbbblz8.fsf@jurta.org> References: <200803122247.58553.pogonyshev@gmx.net> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1205362653 29803 80.91.229.12 (12 Mar 2008 22:57:33 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 12 Mar 2008 22:57:33 +0000 (UTC) Cc: emacs-devel@gnu.org, Paul Pogonyshev To: Stefan Monnier Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Wed Mar 12 23:58:00 2008 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1JZZtW-0005TI-A4 for ged-emacs-devel@m.gmane.org; Wed, 12 Mar 2008 23:57:58 +0100 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JZZsx-0007O7-Mw for ged-emacs-devel@m.gmane.org; Wed, 12 Mar 2008 18:57:23 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1JZZst-0007NJ-Fg for emacs-devel@gnu.org; Wed, 12 Mar 2008 18:57:19 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1JZZsr-0007Kb-Eo for emacs-devel@gnu.org; Wed, 12 Mar 2008 18:57:19 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JZZsr-0007KK-6f for emacs-devel@gnu.org; Wed, 12 Mar 2008 18:57:17 -0400 Original-Received: from relay02.kiev.sovam.com ([62.64.120.197]) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1JZZsq-0001sP-E9 for emacs-devel@gnu.org; Wed, 12 Mar 2008 18:57:16 -0400 Original-Received: from [83.170.232.243] (helo=smtp.svitonline.com) by relay02.kiev.sovam.com with esmtp (Exim 4.67) (envelope-from ) id 1JZZso-0005jY-BJ; Thu, 13 Mar 2008 00:57:14 +0200 In-Reply-To: (Stefan Monnier's message of "Wed, 12 Mar 2008 17:30:49 -0400") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (x86_64-unknown-linux-gnu) X-Scanner-Signature: 8abf2c83e696415c40c55866f9369f42 X-DrWeb-checked: yes X-SpamTest-Envelope-From: juri@jurta.org X-SpamTest-Group-ID: 00000000 X-SpamTest-Header: Not Detected X-SpamTest-Info: Profiles 2396 [Mar 12 2008] X-SpamTest-Info: helo_type=3 X-SpamTest-Info: {HEADERS: header Content-Type found without required header Content-Transfer-Encoding} X-SpamTest-Method: none X-SpamTest-Rate: 11 X-SpamTest-Status: Not detected X-SpamTest-Status-Extended: not_detected X-SpamTest-Version: SMTP-Filter Version 3.0.0 [0255], KAS30/Release X-detected-kernel: by monty-python.gnu.org: FreeBSD 6.x (1) X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:92328 Archived-At: >> I regularly open Java source archive (JAR of several tens of megabytes) >> in Emacs. Recently I recompiled Emacs from CVS and noticed that process >> of opening and parsing archive had become times slower (didn't measure >> precisely, but I guess about 5--10x slowdown is there). Can anyone >> investigate the problem or just guess what changes caused it? I don't >> remember when I compiled Emacs previously, I guess it was a couple month >> old. > > I reported a similar problem. I believe set-buffer-multibyte is *a lot* > slower now, and may even have a time complexity of O(N^2). Unfortunately, this problem destroyed one my important archive today :-( A 20-megabyte archive that in Emacs 22 opens within 1 sec, in Emacs 23 froze for several minutes, so I was forced to interrupt its visiting with C-g. After that, I run a compilation process in another buffer, that started to automatically save the archive's buffer that was marked as modified. As a result, the archive file was corrupted by this automatic saving. -- Juri Linkov http://www.jurta.org/emacs/