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#73046: 29.4; Emacs 100% CPU usage for several seconds when opening dired buffer over TRAMP Date: Sat, 07 Sep 2024 18:07:17 +0300 Message-ID: <86a5gjy02i.fsf@gnu.org> References: <87o75241qh.fsf@gmail.com> <86plpi2ixa.fsf@gnu.org> <87seudke20.fsf@gmail.com> <8634md2vc2.fsf@gnu.org> <87h6asrk42.fsf@gmx.de> <86a5gk28ht.fsf@gnu.org> <87le0450x8.fsf@gmx.de> <865xr8228d.fsf@gnu.org> <87jzfofzcl.fsf@gmail.com> <8634mc1ty0.fsf@gnu.org> <87h6asl3hl.fsf@gmail.com> <86ttesyo1t.fsf@gnu.org> <87bk0zjzt1.fsf@gmx.de> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="37519"; mail-complaints-to="usenet@ciao.gmane.io" Cc: suhailsingh247@gmail.com, 73046@debbugs.gnu.org To: Michael Albinus Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sat Sep 07 17:08:17 2024 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 1smx2t-0009aT-7t for geb-bug-gnu-emacs@m.gmane-mx.org; 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Sat, 07 Sep 2024 11:07:28 -0400 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 1smx20-000691-Tq; Sat, 07 Sep 2024 11:07:20 -0400 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=yExCENKow2IJjCqHHfl0tgMu0yZ61Q0rZ6aoTbv8lNM=; b=cXcC4/1mVdj0 75jg8HKponRdnBdwd2T4gCEPcnTJMvj2Xpv414Kai8K8jcuAa5nYLdbADkGauCgbYdKym9Jsv3nR0 m3PneAg830hfR35q6YSwCcg47ig+49TtEQ7Mq0tb5oK9TbnwBpjvANarv4e9/Oo+lYAbz1fe+P4JX RPViacFHTizB3SD7QO7x2rA3MqWlq6YGvPqbP/5WOt8ak3CSBYR81GjZfSTFXjvlP5dst8rGqIkEL b8mQTmSXx8LFhKD539IlgisO6ythPT6jz7sTaI4HXIQ/NuvgR112UiKzMoGbDYg4OexLABqwtYB1W oWO5UjVRWd7NkLTk0Yp21A==; In-Reply-To: <87bk0zjzt1.fsf@gmx.de> (message from Michael Albinus on Sat, 07 Sep 2024 16:36:42 +0200) 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:291394 Archived-At: > From: Michael Albinus > Cc: Suhail Singh , 73046@debbugs.gnu.org > Date: Sat, 07 Sep 2024 16:36:42 +0200 > > Eli Zaretskii writes: > > > Michael, what do these checks entail, and why are they so > > CPU-expensive and take a lot of time with slow connections? > > I made a test. In a remote directory I have created a cyclic symlink > "zzz", in order to see what Tramp does when running dired on the > directory. The additional actions are > [...] > 15 times the "test -h" command - I guess, Tramp shall do cyclic link > detection better. I agree. But that only explains the time delay, no why Emacs is consuming 100% of CPU, right? Waiting for the network should not consume CPU, unless I'm missing something. Also, Suhail Singh says that there's a significant delay when there are valid symlinks, in which case I don't expect Tramp to issue the same command 15 times, right? I'm sorry to insist on understanding these fine details, but my experience is that without a good understanding of a problem we might devise a solution that is only a partial one. Thanks.