Received: (at 45200) by debbugs.gnu.org; 12 Dec 2020 20:16:15 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Dec 12 15:16:15 2020 Received: from localhost ([127.0.0.1]:46762 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1koBJP-0001K0-39 for submit <at> debbugs.gnu.org; Sat, 12 Dec 2020 15:16:15 -0500 Received: from eggs.gnu.org ([209.51.188.92]:53982) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <eliz@HIDDEN>) id 1koBJO-0001Jc-42 for 45200 <at> debbugs.gnu.org; Sat, 12 Dec 2020 15:16:14 -0500 Received: from fencepost.gnu.org ([2001:470:142:3::e]:51314) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from <eliz@HIDDEN>) id 1koBJH-0002dH-DS; Sat, 12 Dec 2020 15:16:08 -0500 Received: from [176.228.60.248] (port=1537 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:RSA_AES_256_CBC_SHA1:256) (Exim 4.82) (envelope-from <eliz@HIDDEN>) id 1koBJG-000875-PR; Sat, 12 Dec 2020 15:16:07 -0500 Date: Sat, 12 Dec 2020 22:15:52 +0200 Message-Id: <83k0tmeq6f.fsf@HIDDEN> From: Eli Zaretskii <eliz@HIDDEN> To: Konstantin Kharlamov <hi-angel@HIDDEN> In-Reply-To: <dd4a240ab3ff14d8f04d02b2504611a4d9f3f816.camel@HIDDEN> (message from Konstantin Kharlamov on Sat, 12 Dec 2020 21:43:10 +0300) Subject: Re: bug#45200: Memory leaks: (garbage-collect) fails to reclaim memory References: <dd4a240ab3ff14d8f04d02b2504611a4d9f3f816.camel@HIDDEN> X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 45200 Cc: 45200 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) > From: Konstantin Kharlamov <hi-angel@HIDDEN> > Date: Sat, 12 Dec 2020 21:43:10 +0300 > > # Steps to reproduce: > > 1. Run `mkdir /tmp/.emacs.d` > 2. Run emacs as `HOME=/tmp/ emacs`, and measure its PSS > 3. Create a file /tmp/.emacs.d/early-init.el with content: > > ;; only run garbage collection on idle > (setq gc-cons-threshold most-positive-fixnum) > (run-with-idle-timer 2 t (lambda () (garbage-collect))) > > 4. Run emacs as `HOME=/tmp/ emacs`, evaluate (garbage-collect), then measure its PSS > > ## Expected > > Size has no statistically-significant difference, because in both cases we garbage-collected memory. > > ## Actual > > Size without calling explicit garbage-collect, from 3 runs, varied around 41.2..41.7 MB. > > Size afterwards, also 3 runs, varied around 45.4..45.5 MB. Could be simply the effect of different stack size, since Emacs's GC is conservative, and when there's doubt whether something is a live object, it won't GC it. I think more specific and detailed evidence is needed to prove your case: which objects were not GC'ed and why.
bug-gnu-emacs@HIDDEN
:bug#45200
; Package emacs
.
Full text available.Received: (at submit) by debbugs.gnu.org; 12 Dec 2020 18:43:23 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Sat Dec 12 13:43:23 2020 Received: from localhost ([127.0.0.1]:46507 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1ko9rX-0000u4-73 for submit <at> debbugs.gnu.org; Sat, 12 Dec 2020 13:43:23 -0500 Received: from lists.gnu.org ([209.51.188.17]:38118) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <hi-angel@HIDDEN>) id 1ko9rV-0000tw-UO for submit <at> debbugs.gnu.org; Sat, 12 Dec 2020 13:43:22 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:41584) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <hi-angel@HIDDEN>) id 1ko9rV-0003wd-I9 for bug-gnu-emacs@HIDDEN; Sat, 12 Dec 2020 13:43:21 -0500 Received: from forward106p.mail.yandex.net ([77.88.28.109]:57409) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <hi-angel@HIDDEN>) id 1ko9rS-0002Tr-D0 for bug-gnu-emacs@HIDDEN; Sat, 12 Dec 2020 13:43:20 -0500 Received: from mxback9g.mail.yandex.net (mxback9g.mail.yandex.net [IPv6:2a02:6b8:c03:7aa:0:640:d10:d80f]) by forward106p.mail.yandex.net (Yandex) with ESMTP id 73FF11C816EE for <bug-gnu-emacs@HIDDEN>; Sat, 12 Dec 2020 21:43:11 +0300 (MSK) Received: from iva8-174eb672ffa9.qloud-c.yandex.net (iva8-174eb672ffa9.qloud-c.yandex.net [2a02:6b8:c0c:b995:0:640:174e:b672]) by mxback9g.mail.yandex.net (mxback/Yandex) with ESMTP id ZktHbZDohB-hBlKKG4K; Sat, 12 Dec 2020 21:43:11 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex.ru; s=mail; t=1607798591; bh=oxv1AY/uOWizwjT7CWACUwRcNqxVlyMGswP6MDIAXkE=; h=To:From:Subject:Message-ID:Date; b=fvJ37UX4cPhGpjoZHd1jmR4+Q/RJTiOLQLEnkgzTqS2kWOgqFYZuXlEPQb/74VlAw JBWnzEARCupotd5Pjt0VPnpVIAPZKSetO1H1ChSmbkkb4uJVgFdW+8G2cKYGoDsgGb R2E1n3mZhyriGoDP/rYPHKORu07AjMCIZ+aozkeY= Authentication-Results: mxback9g.mail.yandex.net; dkim=pass header.i=@yandex.ru Received: by iva8-174eb672ffa9.qloud-c.yandex.net (smtp/Yandex) with ESMTPSA id XHIvb3LCoV-hAI0l86g; Sat, 12 Dec 2020 21:43:10 +0300 (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (Client certificate not present) Message-ID: <dd4a240ab3ff14d8f04d02b2504611a4d9f3f816.camel@HIDDEN> Subject: Memory leaks: (garbage-collect) fails to reclaim memory From: Konstantin Kharlamov <hi-angel@HIDDEN> To: bug-gnu-emacs@HIDDEN Date: Sat, 12 Dec 2020 21:43:10 +0300 Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.38.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=77.88.28.109; envelope-from=hi-angel@HIDDEN; helo=forward106p.mail.yandex.net X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Score: 0.7 (/) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -2.3 (--) The problem is basically: (garbage-collect) refuses to collect some of the memory. It is more visible if you delay garbage collection, which is what I do for for performance-related reasons. My config has the following snippet: ;; only run garbage collection on idle (setq gc-cons-threshold most-positive-fixnum) (run-with-idle-timer 2 t (lambda () (garbage-collect))) How much memory gets lost depends on configuration. For me right after start the difference is 40 MB: ≈60 MB is Emacs PSS size without above code, and ≈100 MB it is when garbage-collection is delayed, *after* I run explicitly (garbage-collect). It is less visible without any other configs, nonetheless it's visible. # Steps to reproduce: 1. Run `mkdir /tmp/.emacs.d` 2. Run emacs as `HOME=/tmp/ emacs`, and measure its PSS 3. Create a file /tmp/.emacs.d/early-init.el with content: ;; only run garbage collection on idle (setq gc-cons-threshold most-positive-fixnum) (run-with-idle-timer 2 t (lambda () (garbage-collect))) 4. Run emacs as `HOME=/tmp/ emacs`, evaluate (garbage-collect), then measure its PSS ## Expected Size has no statistically-significant difference, because in both cases we garbage-collected memory. ## Actual Size without calling explicit garbage-collect, from 3 runs, varied around 41.2..41.7 MB. Size afterwards, also 3 runs, varied around 45.4..45.5 MB. This is 4 MB lost. While not much, but as I mentioned it grows as much as to 40MB. The Emacs whose emacslient I'm using to write this email has size 218 MB, and now I wouldn't be surprised if much of that is actually a leaked memory. # Version Emacs-git 28.0.50, build from commit abd15e088e99
Konstantin Kharlamov <hi-angel@HIDDEN>
:bug-gnu-emacs@HIDDEN
.
Full text available.bug-gnu-emacs@HIDDEN
:bug#45200
; Package emacs
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