From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Lars Ingebrigtsen <larsi@gnus.org> Newsgroups: gmane.emacs.bugs Subject: bug#36566: 27.0.50; debug is sometimes horribly slow Date: Sat, 14 May 2022 17:45:01 +0200 Message-ID: <87lev4jeyq.fsf@gnus.org> References: <87r26yvb4r.fsf@web.de> <871ryy2l1t.fsf@gmail.com> <87r26xjyon.fsf@web.de> <877e8llbzo.fsf@runbox.com> <8736ilaepu.fsf@runbox.com> <87h871u24i.fsf@gmail.com> <874l2vcrtn.fsf@runbox.com> <874l2eosa7.fsf@gmail.com> <87mufh8jj2.fsf@runbox.com> <87v9tza6gg.fsf@gmail.com> <875zlvj453.fsf@runbox.com> <87bkwp2pjr.fsf@gnus.org> <87a6c72v1t.fsf@runbox.com> <87k0bb16jc.fsf@web.de> <874k2ed828.fsf@gnus.org> <875ym931t9.fsf@runbox.com> <87mtfl1kxt.fsf@gnus.org> <87h75s3gx8.fsf@web.de> <87pmkgl52s.fsf@gnus.org> <jwvk0aofcs4.fsf-monnier+emacs@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="8755"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/29.0.50 (gnu/linux) Cc: Michael Heerdegen <michael_heerdegen@web.de>, Gemini Lasswell <gazally@runbox.com>, 36566@debbugs.gnu.org, Noam Postavsky <npostavs@gmail.com> To: Stefan Monnier <monnier@iro.umontreal.ca> Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat May 14 17:46:37 2022 Return-path: <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org> 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 <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org>) id 1nptyV-000203-41 for geb-bug-gnu-emacs@m.gmane-mx.org; Sat, 14 May 2022 17:46:35 +0200 Original-Received: from localhost ([::1]:45116 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org>) id 1nptyT-0004u5-Ir for geb-bug-gnu-emacs@m.gmane-mx.org; 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Sat, 14 May 2022 15:46:03 +0000 Original-Received: (at 36566) by debbugs.gnu.org; 14 May 2022 15:45:13 +0000 Original-Received: from localhost ([127.0.0.1]:47313 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces@debbugs.gnu.org>) id 1nptxB-0002x2-Ck for submit@debbugs.gnu.org; Sat, 14 May 2022 11:45:13 -0400 Original-Received: from quimby.gnus.org ([95.216.78.240]:50392) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <larsi@gnus.org>) id 1nptxA-0002qK-9q for 36566@debbugs.gnu.org; Sat, 14 May 2022 11:45:12 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnus.org; s=20200322; h=Content-Transfer-Encoding:Content-Type:MIME-Version:Message-ID :In-Reply-To:Date:References:Subject:Cc:To:From:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=rX4Nbr+VMvxV2MF9r+lPc7YN0PXwlFHHqli1GQqw+ic=; b=hHq83fB5u8lujJTU1C5qKoeR/Q nJcTqMkvw1je6arRbG49lq4UfGyomPi1N8aNiKitLV+s14CUMQdxCj/poIQxarpc7QMHofti68Aju KoR6FMgSCg6wY4dH08Z3DEfhy3KLm78Wuf6ToNCCtMxOwxlN/oX+wUhtSzUTsmRC5o2M=; Original-Received: from [84.212.220.105] (helo=xo) by quimby.gnus.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from <larsi@gnus.org>) id 1nptwz-0005g0-Um; Sat, 14 May 2022 17:45:04 +0200 In-Reply-To: <jwvk0aofcs4.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Sat, 14 May 2022 09:52:32 -0400") 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" <bug-gnu-emacs.gnu.org> List-Unsubscribe: <https://lists.gnu.org/mailman/options/bug-gnu-emacs>, <mailto:bug-gnu-emacs-request@gnu.org?subject=unsubscribe> List-Archive: <https://lists.gnu.org/archive/html/bug-gnu-emacs> List-Post: <mailto:bug-gnu-emacs@gnu.org> List-Help: <mailto:bug-gnu-emacs-request@gnu.org?subject=help> List-Subscribe: <https://lists.gnu.org/mailman/listinfo/bug-gnu-emacs>, <mailto:bug-gnu-emacs-request@gnu.org?subject=subscribe> Errors-To: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Original-Sender: "bug-gnu-emacs" <bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org> Xref: news.gmane.io gmane.emacs.bugs:232247 Archived-At: <http://permalink.gmane.org/gmane.emacs.bugs/232247> Stefan Monnier <monnier@iro.umontreal.ca> writes: > How 'bout using a `print-char-length` limit after which we truncate? > The truncation could "respect trees" in the sense that we'd truncate > > (((a b c) (d e f) (g h k))) > > to something like > > (((a b c) (d e ...) ...)) > > rather than to > > (((a b c) (d e ... > > if the `print-char-length` is 14. > > I suspect that with such a limit we should eliminate "all" performance > issues, because printing should then have a complexity > O(print-char-length) rather than O(sizeof(object)), except for the > `print--preprocess` part which would still be O(sizeof(object)), but > since that one is all written in C (and performs a lot less work) the > constant is such much lower that it rarely dominates. Hm... that sounds really attractive, I think. I'm trying to think of any circumstances I'd rather see the current print-length algo instead of this one, and I'm coming up blank. =F0=9F=98=80 The only issue is "oh no, not yet another printing variable" (that people will be setting to 14 in ~/.emacs and then everything that does `prin1' to write out data will fail). I did suggest (in conjunction with another bug report in this area) that we should just extend `prin1{,-to-string}' with a parameter that would set (on the C level) an equivalent variable. So we'd have (prin1 object fun `((char-length . ,edebug-print-char-length))) etc. (And `t' would be "all defaults".) Perhaps I should just implement that stuff first. --=20 (domestic pets only, the antidote for overdose, milk.) bloggy blog: http://lars.ingebrigtsen.no