From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen Newsgroups: gmane.emacs.bugs Subject: bug#6964: 23.2; revert-buffer takes 60 times longer than initial read Date: Wed, 21 Aug 2019 15:30:58 -0700 Message-ID: <8736huw3q5.fsf@mouse.gnus.org> References: <4C7E6AD5.4010102@smart.net> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="30139"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) Cc: 6964@debbugs.gnu.org To: "Daniel B." Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Aug 22 00:32:52 2019 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1i0Z9w-0007j7-IT for geb-bug-gnu-emacs@m.gmane.org; Thu, 22 Aug 2019 00:32:52 +0200 Original-Received: from localhost ([::1]:36540 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i0Z9v-0007zb-F7 for geb-bug-gnu-emacs@m.gmane.org; Wed, 21 Aug 2019 18:32:51 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:40714) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i0Z9J-0007Wy-Ei for bug-gnu-emacs@gnu.org; Wed, 21 Aug 2019 18:32:15 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i0Z9G-0002c8-EM for bug-gnu-emacs@gnu.org; Wed, 21 Aug 2019 18:32:12 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:56145) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1i0Z9A-0002XN-Ew for bug-gnu-emacs@gnu.org; Wed, 21 Aug 2019 18:32:04 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1i0Z98-0001Mh-D8 for bug-gnu-emacs@gnu.org; Wed, 21 Aug 2019 18:32:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Lars Ingebrigtsen Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Wed, 21 Aug 2019 22:32:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 6964 X-GNU-PR-Package: emacs Original-Received: via spool by 6964-submit@debbugs.gnu.org id=B6964.15664266705158 (code B ref 6964); Wed, 21 Aug 2019 22:32:02 +0000 Original-Received: (at 6964) by debbugs.gnu.org; 21 Aug 2019 22:31:10 +0000 Original-Received: from localhost ([127.0.0.1]:36724 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1i0Z8H-0001L7-TP for submit@debbugs.gnu.org; Wed, 21 Aug 2019 18:31:10 -0400 Original-Received: from quimby.gnus.org ([80.91.231.51]:44372) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1i0Z8F-0001Kx-3x for 6964@debbugs.gnu.org; Wed, 21 Aug 2019 18:31:08 -0400 Original-Received: from [76.14.1.154] (helo=sandy) by quimby.gnus.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1i0Z89-0007Ct-5r; Thu, 22 Aug 2019 00:31:03 +0200 In-Reply-To: <4C7E6AD5.4010102@smart.net> (Daniel B.'s message of "Wed, 01 Sep 2010 11:01:41 -0400") X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.51.188.43 X-BeenThere: bug-gnu-emacs@gnu.org List-Id: "Bug reports for GNU Emacs, the Swiss army knife of text editors" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.org gmane.emacs.bugs:165534 Archived-At: "Daniel B." writes: > Reverting a file (executing revert-buffer) takes much (e.g., 60 times) > longer than reading the file initially. > > For a 30MB file that originally took about 3 seconds to load, executing > revert-buffer took 179 seconds. (I'm going through old bug reports that have unfortunately gotten no attention yet.) I tried reproducing this with a 200MB binary file. Reading it initially took less than a second, and saying `M-x revert-buffer' seemed to take about the same time. Are you still seeing this problem, and if so, what kind of data do you have in the buffer when it takes this long? -- (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no