From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: =?utf-8?Q?=C3=93scar_Fuentes?= Newsgroups: gmane.emacs.devel Subject: Re: Any way of dumping strings? Date: Wed, 02 Jun 2021 20:33:22 +0200 Message-ID: <87r1hkazgt.fsf@telefonica.net> References: <87zgw8b3n9.fsf@telefonica.net> <83fsy0xjrd.fsf@gnu.org> <87v96wb19v.fsf@telefonica.net> <83czt4xhc7.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="32527"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) To: emacs-devel@gnu.org Cancel-Lock: sha1:aSSwKWDlfyHVKfTBaaH9tmkpJAY= Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Wed Jun 02 20:34:35 2021 Return-path: Envelope-to: ged-emacs-devel@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 1loVhL-0008CA-H1 for ged-emacs-devel@m.gmane-mx.org; Wed, 02 Jun 2021 20:34:35 +0200 Original-Received: from localhost ([::1]:36548 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1loVhK-0003La-Ii for ged-emacs-devel@m.gmane-mx.org; Wed, 02 Jun 2021 14:34:34 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:57522) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1loVgK-00020Q-HX for emacs-devel@gnu.org; Wed, 02 Jun 2021 14:33:32 -0400 Original-Received: from ciao.gmane.io ([116.202.254.214]:43778) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1loVgI-0001xB-BP for emacs-devel@gnu.org; Wed, 02 Jun 2021 14:33:32 -0400 Original-Received: from list by ciao.gmane.io with local (Exim 4.92) (envelope-from ) id 1loVgG-0006fs-EG for emacs-devel@gnu.org; Wed, 02 Jun 2021 20:33:28 +0200 X-Injected-Via-Gmane: http://gmane.org/ Received-SPF: pass client-ip=116.202.254.214; envelope-from=ged-emacs-devel@m.gmane-mx.org; helo=ciao.gmane.io X-Spam_score_int: -16 X-Spam_score: -1.7 X-Spam_bar: - X-Spam_report: (-1.7 / 5.0 requ) BAYES_00=-1.9, HEADER_FROM_DIFFERENT_DOMAINS=0.249, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 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-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:270319 Archived-At: Eli Zaretskii writes: >> From: Óscar Fuentes >> Date: Wed, 02 Jun 2021 19:54:20 +0200 >> >> > Set a GDB breakpoint in mark_vectorlike, with commands that dump each >> > vector, then trigger GC? >> >> I was hoping for something that could show at least thousands of >> instances. Going one by one would be extremely time-consuming and >> potentially deceptive. > > That's not what I had in mind. You can set up breakpoint commands > that dump the contents of the vector being marked, then continue > without stopping. Then say "set logging on", so that the output goes > to a file, and let Emacs run. Once GC finishes, you will have a file > with all the vectors in it; then you can examine them at your leisure. That looks quite useful for this purpose, thanks. Now that I think of it, my impression on the past session was that performance degraded quite a bit, which could indicate that a very large number of objects was live (which implies that the leaked objects are relatively small, right?). >> Even if it doesn't, maybe it is enough to dump the whole image to a >> file. Some part would be gc-ed data, but a comparatively small part >> among all the rest of hundreds of MB. > > How would you tell the one from the other? I wouldn't. I'll just do some crude frequency analysis expecting that GCed data is noise among the much larger signal of live data.