From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r109187: Adjust consing_since_gc when objects are explicitly freed. Date: Tue, 24 Jul 2012 05:11:05 -0400 Message-ID: References: <500D18D4.7010506@yandex.ru> <500D36C6.7000205@yandex.ru> <500E24D0.2040003@yandex.ru> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: dough.gmane.org 1343121088 29936 80.91.229.3 (24 Jul 2012 09:11:28 GMT) X-Complaints-To: usenet@dough.gmane.org NNTP-Posting-Date: Tue, 24 Jul 2012 09:11:28 +0000 (UTC) Cc: emacs-devel@gnu.org To: Dmitry Antipov Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Tue Jul 24 11:11:28 2012 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 1Stb9H-0005oU-Hy for ged-emacs-devel@m.gmane.org; Tue, 24 Jul 2012 11:11:23 +0200 Original-Received: from localhost ([::1]:56594 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Stb9G-00074W-Q9 for ged-emacs-devel@m.gmane.org; Tue, 24 Jul 2012 05:11:22 -0400 Original-Received: from eggs.gnu.org ([208.118.235.92]:56174) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Stb99-00074H-I0 for emacs-devel@gnu.org; Tue, 24 Jul 2012 05:11:21 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Stb93-0007PR-Rb for emacs-devel@gnu.org; Tue, 24 Jul 2012 05:11:15 -0400 Original-Received: from pruche.dit.umontreal.ca ([132.204.246.22]:48228) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Stb93-0007PN-NI for emacs-devel@gnu.org; Tue, 24 Jul 2012 05:11:09 -0400 Original-Received: from fmsmemgm.homelinux.net (lechon.iro.umontreal.ca [132.204.27.242]) by pruche.dit.umontreal.ca (8.14.1/8.14.1) with ESMTP id q6O9B6ej002968; Tue, 24 Jul 2012 05:11:07 -0400 Original-Received: by fmsmemgm.homelinux.net (Postfix, from userid 20848) id 836ECAE3BA; Tue, 24 Jul 2012 05:11:05 -0400 (EDT) In-Reply-To: <500E24D0.2040003@yandex.ru> (Dmitry Antipov's message of "Tue, 24 Jul 2012 08:30:08 +0400") User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1.50 (gnu/linux) X-NAI-Spam-Flag: NO X-NAI-Spam-Threshold: 5 X-NAI-Spam-Score: 0 X-NAI-Spam-Rules: 1 Rules triggered RV4288=0 X-NAI-Spam-Version: 2.2.0.9309 : core <4288> : streams <789715> : uri <1173366> X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 132.204.246.22 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:151850 Archived-At: >> What helps? Adding those calls to free_marker, or adding the "decrement >> consing_since_gc in free_marker"? I can believe the first, but I doubt >> the second will make much of a difference. > Local: both conses and markers are allocated very often, and > explicitly freed ones most probably will be re-used again very soon, > at the cost of link to/unlink from the free lists, thus avoiding > possible new block allocation. > Global: Ideal GC manages an infinite amount of memory so the > collection is never started. For the real cases, some time periods are > more advisable for running GC (when we're idle, for example); but, > since we can't predict when "more advisable" time comes, it's the best > bet to run GC as later as possible for the same amount of work. I do not understand how that answers my question. So to repeat: do you claim that "decrement consing_since_gc in free_marker" helps performance? If so, do you have concrete measurements showing it? Stefan