From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.devel Subject: Re: warn-maybe-out-of-memory Date: Fri, 11 Jul 2014 13:00:50 +0300 Message-ID: <831ttsb4fh.fsf@gnu.org> References: <83egxtax97.fsf@gnu.org> <83d2ddaw52.fsf@gnu.org> <53BF6B2F.5030701@yandex.ru> <837g3kbd9g.fsf@gnu.org> <53BFA3BB.6090709@yandex.ru> <8361j4b744.fsf@gnu.org> <53BFB1C3.9020202@yandex.ru> Reply-To: Eli Zaretskii NNTP-Posting-Host: plane.gmane.org X-Trace: ger.gmane.org 1405072920 25951 80.91.229.3 (11 Jul 2014 10:02:00 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 11 Jul 2014 10:02:00 +0000 (UTC) Cc: emacs-devel@gnu.org To: Dmitry Antipov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Jul 11 12:01:53 2014 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1X5XeK-00044g-5D for ged-emacs-devel@m.gmane.org; Fri, 11 Jul 2014 12:01:52 +0200 Original-Received: from localhost ([::1]:43567 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X5XeJ-0006a0-Pj for ged-emacs-devel@m.gmane.org; Fri, 11 Jul 2014 06:01:51 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:59163) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X5XdX-0006WN-Ru for emacs-devel@gnu.org; Fri, 11 Jul 2014 06:01:49 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X5XdI-0007PC-S4 for emacs-devel@gnu.org; Fri, 11 Jul 2014 06:01:03 -0400 Original-Received: from mtaout21.012.net.il ([80.179.55.169]:50365) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X5XdI-0007MH-Ho for emacs-devel@gnu.org; Fri, 11 Jul 2014 06:00:48 -0400 Original-Received: from conversion-daemon.a-mtaout21.012.net.il by a-mtaout21.012.net.il (HyperSendmail v2007.08) id <0N8J00800KSCLG00@a-mtaout21.012.net.il> for emacs-devel@gnu.org; Fri, 11 Jul 2014 13:00:46 +0300 (IDT) Original-Received: from HOME-C4E4A596F7 ([87.69.4.28]) by a-mtaout21.012.net.il (HyperSendmail v2007.08) with ESMTPA id <0N8J008HJL5ALI10@a-mtaout21.012.net.il>; Fri, 11 Jul 2014 13:00:46 +0300 (IDT) In-reply-to: <53BFB1C3.9020202@yandex.ru> X-012-Sender: halo1@inter.net.il X-detected-operating-system: by eggs.gnu.org: Solaris 10 X-Received-From: 80.179.55.169 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 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-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:172972 Archived-At: > Date: Fri, 11 Jul 2014 13:43:31 +0400 > From: Dmitry Antipov > CC: emacs-devel@gnu.org > > On 07/11/2014 01:02 PM, Eli Zaretskii wrote: > > > I mean the cases where the file size is borderline, near the available > > memory, but slightly less than that. > > We may warn if file size reaches or exceeds, say, 90% of available memory. That's a good start. But decoding non-ASCII text could expand the size by a factor of 2 in many cases, so perhaps 50% is a better threshold, at least in non-English locales? > > Then how does this feature make sense? It is, according to you, > > unpredictable and uncontrollable. > > This depends on OS and VM pressure. For example, on GNU/Linux if I have > just slightly above 8G free: > > $ free > total used free shared buffers cached > Mem: 16127204 7762072 8365132 68248 84396 6401276 > -/+ buffers/cache: 1276400 14850804 > > and asks for 10G, the kernel may shrink page cache by 2G and satisfy > 10G mmap request, thus fooling the logic I'm using to issue the warning. On Windows, the swap file is enlarged in this situation. > But under some circumstances, this may be not so; in short, I think that > we need to support more OSes and gather more feedback from users. Agreed. Btw, this feature is all but useless for 32-bit builds on any modern machine, since the buffer size limitation almost always hits much sooner.