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#66117: 30.0.50; `find-buffer-visiting' is slow when opening large number of buffers Date: Tue, 12 Dec 2023 21:20:06 +0200 Message-ID: <831qbrtehl.fsf@gnu.org> References: <878r919qfh.fsf@localhost> <87lecp84mf.fsf@localhost> <83ttrdx8j9.fsf@gnu.org> <87a5su261p.fsf@localhost> <838r8e24yy.fsf@gnu.org> <87y1gezspg.fsf@localhost> <834jj21z05.fsf@gnu.org> <87il7izo4l.fsf@localhost> <831qe61xrh.fsf@gnu.org> <87cyxqzmhh.fsf@localhost> <83zg0uzlgw.fsf@gnu.org> <87v8bhxzcu.fsf@localhost> <83y1gdxws8.fsf@gnu.org> <87jzrwm7ul.fsf@localhost> <87h6n0m781.fsf@localhost> <87v8935wik.fsf@localhost> <83msuftr0i.fsf@gnu.org> <87plzbxtxa.fsf@localhost> <83fs07tjre.fsf@gnu.org> <87msufxqmo.fsf@localhost> <83a5qftghr.fsf@gnu.org> <87jzpjxm9w.fsf@localhost> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="23625"; mail-complaints-to="usenet@ciao.gmane.io" Cc: dmitry@gutov.dev, 66117@debbugs.gnu.org, monnier@iro.umontreal.ca To: Ihor Radchenko Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Dec 12 20:21:05 2023 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 1rD8JU-0005wB-3a for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 12 Dec 2023 20:21:04 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rD8JE-0006Vl-44; Tue, 12 Dec 2023 14:20:48 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rD8JD-0006Vd-7c for bug-gnu-emacs@gnu.org; Tue, 12 Dec 2023 14:20:47 -0500 Original-Received: from debbugs.gnu.org ([2001:470:142:5::43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1rD8JC-0000kb-VE for bug-gnu-emacs@gnu.org; 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Tue, 12 Dec 2023 14:20:43 -0500 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rD8Il-0000cX-Nw; Tue, 12 Dec 2023 14:20:20 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=gnu.org; s=fencepost-gnu-org; h=References:Subject:In-Reply-To:To:From:Date: mime-version; bh=TZHHJJTXJmumhechFaUJbJYQz0jGcfI0NCmLmlmP5GU=; b=F/smfgi09Mcq KMNlfIL2o41vJw9x9dZOZvdTlfIfc+L+/1SNlq36mYdWeF1VCn6HHiDlSm0OIbrZkXqjke14zMMhM Q5OSCFm7tCAzRijHSPc/n4VJIyZP+FZYYEzI3KAiEcbf9l2e3OkJyzCh2ASq6bAaM3pWyYI7PxMuf pTY5XPXySks0yMU4pk1b7PF0IkSxUyOTVpgz6jikyYrsj/egciWQvvABd3PV5srrFu8GzdITqC/WC C+TPAXd5B+21jo0DZzZNRmGcPX3IgRZYaBbFzt11gX+D6TbKLmcFiCD/wFxc3/sopKN91Y7xF88+3 5fpuPiMtc/6M0qZoJFQfUg==; In-Reply-To: <87jzpjxm9w.fsf@localhost> (message from Ihor Radchenko on Tue, 12 Dec 2023 19:18:19 +0000) 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-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Xref: news.gmane.io gmane.emacs.bugs:276075 Archived-At: > From: Ihor Radchenko > Cc: monnier@iro.umontreal.ca, dmitry@gutov.dev, 66117@debbugs.gnu.org > Date: Tue, 12 Dec 2023 19:18:19 +0000 > > Eli Zaretskii writes: > > >> > So for starters, we make each BVAR more expensive, i.e. make Emacs > >> > uniformly slower (because we call BVAR all over the place). > >> > >> Yes, although I do not believe that it will have large impact in > >> practice. It is just an extra == comparison. > > > > We've seen how similar extra comparisons slow down Emacs when we > > introduced symbols-with-location. IMO, BVAR might be even more > > expensive, since it is used much more frequently and widely. > > It might. Do you know a good way to test such thing? Because I do not > think that a mere suspicion that this change might make things slower > should stop the discussion. To measure such things, you need to run some benchmarks. Byte-compiling might be one such kind; "make bootstrap" could be another; scrolling one line at a time through a large file could be yet another one. Several such benchmarks were posted to the lists on several similar occasions.