From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.devel Subject: Re: Why bother porting Guile to BDW-GC? Date: Mon, 10 Nov 2008 22:10:02 +0100 Message-ID: <87tzafp9sl.fsf@gnu.org> References: <87skq2jjl4.fsf@gnu.org> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: ger.gmane.org 1226351500 31338 80.91.229.12 (10 Nov 2008 21:11:40 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Mon, 10 Nov 2008 21:11:40 +0000 (UTC) To: guile-devel@gnu.org Original-X-From: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Mon Nov 10 22:12:41 2008 Return-path: Envelope-to: guile-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1Kze3W-0006qK-OD for guile-devel@m.gmane.org; Mon, 10 Nov 2008 22:12:19 +0100 Original-Received: from localhost ([127.0.0.1]:50489 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Kze2O-0003Ke-K1 for guile-devel@m.gmane.org; Mon, 10 Nov 2008 16:11:08 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1Kze1a-00038Y-42 for guile-devel@gnu.org; Mon, 10 Nov 2008 16:10:18 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1Kze1Y-00037w-Qu for guile-devel@gnu.org; Mon, 10 Nov 2008 16:10:17 -0500 Original-Received: from [199.232.76.173] (port=58551 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Kze1Y-00037o-GU for guile-devel@gnu.org; Mon, 10 Nov 2008 16:10:16 -0500 Original-Received: from main.gmane.org ([80.91.229.2]:35258 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1Kze1W-0001EB-UY for guile-devel@gnu.org; Mon, 10 Nov 2008 16:10:15 -0500 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1Kze1S-0001O4-CL for guile-devel@gnu.org; Mon, 10 Nov 2008 21:10:10 +0000 Original-Received: from reverse-83.fdn.fr ([80.67.176.83]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 10 Nov 2008 21:10:10 +0000 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Mon, 10 Nov 2008 21:10:10 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 25 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 20 Brumaire an 217 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: i686-pc-linux-gnu User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux) Cancel-Lock: sha1:VkJz+UnD3yqx9znvYEXQz9GsX/0= X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Developers list for Guile, the GNU extensibility library" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Errors-To: guile-devel-bounces+guile-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.devel:7818 Archived-At: Hello! One more thought... ludo@gnu.org (Ludovic Courtès) writes: > 3. Benefit from an all-knowing GC. While Guile's GC knows only about > the stack(s), registers and "cell heap", BDW-GC knows about all of > a process' storage: stack(s), registers, the whole heap, > thread-local storage, etc. > > Concrete benefits: 3g. No need to tell Guile about much memory is allocated behind its back, e.g., with malloc(3). This makes `scm_gc_register_collectable_memory ()' and friends (info "(guile) Memory Blocks") no-ops. It also means that BDW-GC has accurate information about heap usage, even in the presence of third party libraries that can't be instrumented to use `scm_gc_malloc ()' et al., allowing it to make informed decisions. Thanks, Ludo'.