From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#38407: 27.0.50; infinite loop with display of large file without newlines Date: Thu, 28 Nov 2019 17:06:11 +0200 Message-ID: <83tv6ooxb0.fsf@gnu.org> References: <39c498717f8958e7fdc408d4da51d378@webmail.orcon.net.nz> Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="118018"; mail-complaints-to="usenet@blaine.gmane.org" Cc: pieter@vanoostrum.org, 38407@debbugs.gnu.org To: Phil Sainty Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Thu Nov 28 16:51:07 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 1iaM4R-000UZ8-CB for geb-bug-gnu-emacs@m.gmane.org; Thu, 28 Nov 2019 16:51:07 +0100 Original-Received: from localhost ([::1]:50270 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iaM4P-000292-Jq for geb-bug-gnu-emacs@m.gmane.org; Thu, 28 Nov 2019 10:51:05 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:49505) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iaLNs-0004wn-CZ for bug-gnu-emacs@gnu.org; Thu, 28 Nov 2019 10:07:10 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iaLNo-0002YO-91 for bug-gnu-emacs@gnu.org; Thu, 28 Nov 2019 10:07:06 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:53018) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iaLNo-0002QJ-37 for bug-gnu-emacs@gnu.org; Thu, 28 Nov 2019 10:07:04 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1iaLNl-0003gg-Ur for bug-gnu-emacs@gnu.org; Thu, 28 Nov 2019 10:07:01 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Thu, 28 Nov 2019 15:07:01 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 38407 X-GNU-PR-Package: emacs Original-Received: via spool by 38407-submit@debbugs.gnu.org id=B38407.157495358414129 (code B ref 38407); Thu, 28 Nov 2019 15:07:01 +0000 Original-Received: (at 38407) by debbugs.gnu.org; 28 Nov 2019 15:06:24 +0000 Original-Received: from localhost ([127.0.0.1]:58991 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iaLNA-0003fp-F7 for submit@debbugs.gnu.org; Thu, 28 Nov 2019 10:06:24 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:37338) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1iaLN8-0003fc-Dn for 38407@debbugs.gnu.org; Thu, 28 Nov 2019 10:06:23 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:43358) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1iaLMt-0007oV-01; Thu, 28 Nov 2019 10:06:07 -0500 Original-Received: from [176.228.60.248] (port=2971 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from ) id 1iaLMp-00006o-Bl; Thu, 28 Nov 2019 10:06:04 -0500 In-reply-to: <39c498717f8958e7fdc408d4da51d378@webmail.orcon.net.nz> (message from Phil Sainty on Thu, 28 Nov 2019 14:22:07 +1300) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] 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:172604 Archived-At: > Date: Thu, 28 Nov 2019 14:22:07 +1300 > From: Phil Sainty > Cc: 38407@debbugs.gnu.org > > On 2019-11-28 10:52, Pieter van Oostrum wrote: > > I used a 100KB json file from my Firefox profile > > Out of interest I went looking for large JSON files in my own Firefox > profiles, and the largest one I could find was an "extensions.json" > which was also roughly 100K. Curiously enough, everything was indeed > dramatically slower than normal in that buffer, even in so-long-mode. > > I also observed that many different human languages were present in > the text, so I thought that bi-directional text processing might be a > factor -- and indeed setting the debug option bidi-display-reordering > to nil in that buffer made a *very* dramatic improvement to > performance. AFAICT, it isn't the bidi reordering in general, it's the BPA part of the reordering -- that file has many embedded bracket characters. I've added a new variable bidi-inhibit-bpa. Try setting it non-nil, and I think you will see performance very similar to disabling the reordering entirely. I guess that's another variable for so-long-mode to futz with... > Similarly, performance was good after using M-x find-file-literally > to visit the file. It makes very little sense to visit a text file with many non-ASCII characters using find-file-literally, IMO.