From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Eli Zaretskii Newsgroups: gmane.emacs.bugs Subject: bug#45200: Memory leaks: (garbage-collect) fails to reclaim memory Date: Sat, 12 Dec 2020 22:15:52 +0200 Message-ID: <83k0tmeq6f.fsf@gnu.org> References: Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="13716"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 45200@debbugs.gnu.org To: Konstantin Kharlamov Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Dec 12 22:28:01 2020 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane-mx.org Original-Received: from lists.gnu.org ([209.51.188.17]) by ciao.gmane.io with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1koCQr-0003TK-OC for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 12 Dec 2020 22:28:01 +0100 Original-Received: from localhost ([::1]:58334 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1koCQq-0002LX-Qe for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 12 Dec 2020 16:28:00 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:47328) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1koBKL-0002zQ-1V for bug-gnu-emacs@gnu.org; Sat, 12 Dec 2020 15:17:20 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]:35222) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1koBKB-0002y5-Hy for bug-gnu-emacs@gnu.org; Sat, 12 Dec 2020 15:17:08 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1koBKB-0001Lx-Bh for bug-gnu-emacs@gnu.org; Sat, 12 Dec 2020 15:17:03 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Sat, 12 Dec 2020 20:17:03 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 45200 X-GNU-PR-Package: emacs Original-Received: via spool by 45200-submit@debbugs.gnu.org id=B45200.16078041755090 (code B ref 45200); Sat, 12 Dec 2020 20:17:03 +0000 Original-Received: (at 45200) by debbugs.gnu.org; 12 Dec 2020 20:16:15 +0000 Original-Received: from localhost ([127.0.0.1]:46762 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1koBJP-0001K0-39 for submit@debbugs.gnu.org; Sat, 12 Dec 2020 15:16:15 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:53982) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1koBJO-0001Jc-42 for 45200@debbugs.gnu.org; Sat, 12 Dec 2020 15:16:14 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:51314) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1koBJH-0002dH-DS; Sat, 12 Dec 2020 15:16:08 -0500 Original-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 ) id 1koBJG-000875-PR; Sat, 12 Dec 2020 15:16:07 -0500 In-Reply-To: (message from Konstantin Kharlamov on Sat, 12 Dec 2020 21:43:10 +0300) X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list 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-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" Xref: news.gmane.io gmane.emacs.bugs:195909 Archived-At: > From: Konstantin Kharlamov > 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.