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#39413: 26.2; Emacs gets hung Date: Mon, 16 Aug 2021 14:35:29 +0300 Message-ID: <83v9458vwe.fsf@gnu.org> References: <85r1ynam0x.fsf@gmail.com> <44e850a0-c8dc-4aec-5706-c52db33697a1@ubin.jp> <119c5df5-080e-c45b-6498-2a2bc0f8273b@yk.rim.or.jp> <83lfme232a.fsf@gnu.org> <0b9cd846-b9f5-8351-5f45-5614bbc644c0@ubin.jp> <87sgfojjmm.fsf@gmail.com> <87fsvhwacb.fsf@gnus.org> <83wnosdwyt.fsf@gnu.org> <277eef17-0241-7245-a801-dc3707c23e5b@yk.rim.or.jp> <838s17dtpa.fsf@gnu.org> Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="36321"; mail-complaints-to="usenet@ciao.gmane.io" Cc: chiaki.ishikawa@ubin.jp, larsi@gnus.org, 39413@debbugs.gnu.org, npostavs@gmail.com To: "ISHIKAWA,chiaki" Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Mon Aug 16 13:36:12 2021 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 1mFauZ-0009EY-VW for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 16 Aug 2021 13:36:11 +0200 Original-Received: from localhost ([::1]:60584 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mFauY-0005yl-DB for geb-bug-gnu-emacs@m.gmane-mx.org; Mon, 16 Aug 2021 07:36:10 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:51114) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mFauQ-0005wn-HB for bug-gnu-emacs@gnu.org; Mon, 16 Aug 2021 07:36:03 -0400 Original-Received: from debbugs.gnu.org ([209.51.188.43]:37107) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1mFauQ-0004rv-7f for bug-gnu-emacs@gnu.org; Mon, 16 Aug 2021 07:36:02 -0400 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1mFauQ-0001oh-5V for bug-gnu-emacs@gnu.org; Mon, 16 Aug 2021 07:36:02 -0400 X-Loop: help-debbugs@gnu.org Resent-From: Eli Zaretskii Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Mon, 16 Aug 2021 11:36:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 39413 X-GNU-PR-Package: emacs X-GNU-PR-Keywords: unreproducible moreinfo Original-Received: via spool by 39413-submit@debbugs.gnu.org id=B39413.16291137516946 (code B ref 39413); Mon, 16 Aug 2021 11:36:02 +0000 Original-Received: (at 39413) by debbugs.gnu.org; 16 Aug 2021 11:35:51 +0000 Original-Received: from localhost ([127.0.0.1]:48653 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mFauB-0001nm-2F for submit@debbugs.gnu.org; Mon, 16 Aug 2021 07:35:51 -0400 Original-Received: from eggs.gnu.org ([209.51.188.92]:34624) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1mFau5-0001nK-JL for 39413@debbugs.gnu.org; Mon, 16 Aug 2021 07:35:45 -0400 Original-Received: from fencepost.gnu.org ([2001:470:142:3::e]:44456) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mFaty-0004et-P4; Mon, 16 Aug 2021 07:35:34 -0400 Original-Received: from 84.94.185.95.cable.012.net.il ([84.94.185.95]:1389 helo=home-c4e4a596f7) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mFaty-0001UA-CA; Mon, 16 Aug 2021 07:35:34 -0400 In-Reply-To: (ishikawa@yk.rim.or.jp) 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" Xref: news.gmane.io gmane.emacs.bugs:211982 Archived-At: > Cc: larsi@gnus.org, npostavs@gmail.com, 39413@debbugs.gnu.org, > chiaki.ishikawa@ubin.jp > From: "ISHIKAWA,chiaki" > Date: Mon, 16 Aug 2021 08:27:01 +0900 > > But if you look slightly above, you will notice CPU core #4 is used 100% > (!). > That is emacs process. No other process is running that earnestly at > that moment. If we believe everything these tools show us, maybe. But those tools suffer from the same problem Emacs does on a busy system: the tool itself might not get CPU to update its data, so you actually see a snapshot of what it saw last time it did get CPU. > PS: I found profiler-cpu-* functions, but I don't think it is wise to > run them during GC since they seem to allocate vector tables. However, > taking a snapshot of strack trace every now and then during GC seems > attractive for my investigation to figure out WHERE in GC, the excessive > time is spent. Emacs built-in profiling will not help us here, because it cannot profile below Lisp primitives.