From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ihor Radchenko Newsgroups: gmane.emacs.bugs Subject: bug#58558: 29.0.50; re-search-forward is slow in some buffers Date: Tue, 13 Dec 2022 10:28:57 +0000 Message-ID: <87tu1zd2c6.fsf@localhost> References: <877d10r21x.fsf@localhost> <87zgdwyvkt.fsf@gnus.org> <87ilkk6ri5.fsf@localhost> <87v8okjei9.fsf@gnus.org> <87tu44jdce.fsf@localhost> <87czasjd9j.fsf@gnus.org> <87k050nio5.fsf@localhost> <87zgdwhw0z.fsf@gnus.org> <83sfjo3tfw.fsf@gnu.org> <878rlfjmjh.fsf@localhost> <87mt9tbbbp.fsf@gnus.org> <8335bl18lo.fsf@gnu.org> <87wn8x9eqb.fsf@gnus.org> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="10656"; mail-complaints-to="usenet@ciao.gmane.io" Cc: 58558@debbugs.gnu.org, Eli Zaretskii , monnier@iro.umontreal.ca To: Lars Ingebrigtsen Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Tue Dec 13 11:30:23 2022 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 1p52YJ-0002cY-Fb for geb-bug-gnu-emacs@m.gmane-mx.org; Tue, 13 Dec 2022 11:30:23 +0100 Original-Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p52Y0-0001My-OL; Tue, 13 Dec 2022 05:30:04 -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 1p52Xz-0001Mp-Km for bug-gnu-emacs@gnu.org; Tue, 13 Dec 2022 05:30:03 -0500 Original-Received: from debbugs.gnu.org ([209.51.188.43]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1p52Xz-0004hk-CV for bug-gnu-emacs@gnu.org; Tue, 13 Dec 2022 05:30:03 -0500 Original-Received: from Debian-debbugs by debbugs.gnu.org with local (Exim 4.84_2) (envelope-from ) id 1p52Xy-0002yB-Q9 for bug-gnu-emacs@gnu.org; Tue, 13 Dec 2022 05:30:02 -0500 X-Loop: help-debbugs@gnu.org Resent-From: Ihor Radchenko Original-Sender: "Debbugs-submit" Resent-CC: bug-gnu-emacs@gnu.org Resent-Date: Tue, 13 Dec 2022 10:30:02 +0000 Resent-Message-ID: Resent-Sender: help-debbugs@gnu.org X-GNU-PR-Message: followup 58558 X-GNU-PR-Package: emacs Original-Received: via spool by 58558-submit@debbugs.gnu.org id=B58558.167092735011371 (code B ref 58558); Tue, 13 Dec 2022 10:30:02 +0000 Original-Received: (at 58558) by debbugs.gnu.org; 13 Dec 2022 10:29:10 +0000 Original-Received: from localhost ([127.0.0.1]:59524 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1p52X8-0002xL-EB for submit@debbugs.gnu.org; Tue, 13 Dec 2022 05:29:10 -0500 Original-Received: from mout01.posteo.de ([185.67.36.65]:53747) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1p52X6-0002xD-1E for 58558@debbugs.gnu.org; Tue, 13 Dec 2022 05:29:08 -0500 Original-Received: from submission (posteo.de [185.67.36.169]) by mout01.posteo.de (Postfix) with ESMTPS id 58AA5240026 for <58558@debbugs.gnu.org>; Tue, 13 Dec 2022 11:28:59 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1670927342; bh=7P/1u2v+wAN/M36sPthhzZ9CiCu9n71LWYXYmGhrYks=; h=From:To:Cc:Subject:Date:From; b=lOhC0BKgAJvXHPVP42YL7UntmHz5Bw+HdkWSZ2qaij64+tEhc0ENg+w23uuNj/K4o dfjGyodS3/ho+8Qw693RuN5M0kOsAlE4MikYzJcnt1DY9q7M9c8gUuVA82Pcsb7D3h MDS4C/d23+grvGuiCOGzm+EH6ITYG1aP9Zwxxsf1oqx06h9MbNGOcYPeNCrj69g+fA ZYE23imMtjDncSI1HYT1xDnGWi+LNTQSEGdwQVSAUEyRabre+3X6TdduMywsyPhmrp TuD+RvpoLJbqWJwv0+QAIoNK/X3L2U1bbpGTE1CmdG4ja7z7dzPBuDa1qzS1Z8dN2U xYsceM2qSMeUw== Original-Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4NWZV24qYWz6tmB; Tue, 13 Dec 2022 11:28:58 +0100 (CET) In-Reply-To: <87wn8x9eqb.fsf@gnus.org> 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:250817 Archived-At: Lars Ingebrigtsen writes: > I thought it might be easier to see the differences in results if one > first attached perf to a fresh (fast) Emacs and got the trace, and the > waited until Emacs got slow, and repeated the same thing under another > trace. > > perf is able to do this by: > > perf record -p -g > > and > > perf report > > then shows me stuff, but I don't even know what to look for when > interpreting that. Or whether perf is, indeed, the right too for this > task. Ok. I got around to try perf, and it turned out to be very easy to get started. perf record -p + perf report already appear to give some clue: 88.27% emacs emacs-30-vcs [.] buf_bytepos_to_charpos 3.75% emacs emacs-30-vcs [.] re_match_2_internal 1.35% emacs emacs-30-vcs [.] scan_sexps_forward 1.03% emacs emacs-30-vcs [.] re_search_2 0.65% emacs emacs-30-vcs [.] find_interval 0.56% emacs emacs-30-vcs [.] sub_char_table_ref 0.55% emacs emacs-30-vcs [.] lookup_char_property The fraction of buf_bytepos_to_charpos increases over repeated benchmark runs. In contrast, using find-file-literally produces 34.44% emacs emacs-30-vcs [.] re_match_2_internal 25.55% emacs emacs-30-vcs [.] scan_sexps_forward 11.09% emacs emacs-30-vcs [.] re_search_2 ... 0.59% emacs emacs-30-vcs [.] buf_bytepos_to_charpos with buf_bytepos_to_charpos taking diminishing cpu sample fraction. Any ideas what I can do further? -- Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at