From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Ken Brown Newsgroups: gmane.emacs.bugs Subject: bug#51734: 29.0.50; got slow Date: Fri, 12 Nov 2021 15:06:33 -0500 Message-ID: <1c5199f3-45ce-c98e-aecd-9ce76b2f7c9c@cornell.edu> References: <83a6ic41g3.fsf@gnu.org> <83pmr715c5.fsf@gnu.org> <83ilwy22y1.fsf@gnu.org> <090472b2-4f54-2f31-cb9e-30956cbcbb31@cornell.edu> <83tugizg8v.fsf@gnu.org> <6ef97cf3-6f8e-40f7-aef9-cbd2755756cc@cornell.edu> <83o86qzbpg.fsf@gnu.org> <843f06f4-3666-1fd9-cad9-860b475b2938@cornell.edu> <83mtmazay6.fsf@gnu.org> <83wnldxjiv.fsf@gnu.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="26062"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.3.0 Cc: 51734-done@debbugs.gnu.org, yamaoka@jpl.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Nov 12 21:07:38 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 1mlcpl-0006Zm-62 for geb-bug-gnu-emacs@m.gmane-mx.org; 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CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:BN7PR04MB4388.namprd04.prod.outlook.com; PTR:; CAT:NONE; SFS:(4636009)(366004)(66946007)(4326008)(8676002)(16576012)(6916009)(53546011)(316002)(508600001)(786003)(38100700002)(31696002)(186003)(5660300002)(66476007)(6486002)(31686004)(26005)(36756003)(66556008)(86362001)(2906002)(75432002)(8936002)(956004)(2616005)(83380400001)(45980500001)(43740500002); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 nwiMYUTxudVr/6PNjnyvqVZrJOVjZT3qqBmddkSIvpSDSrD+X/mh4WW2unCy8J3cFedlDodEqyWibn0CXhLH18OZj7Q+kMbrei X-OriginatorOrg: cornell.edu X-MS-Exchange-CrossTenant-Network-Message-Id: 9f80e435-9cda-4861-868a-08d9a617eda9 X-MS-Exchange-CrossTenant-AuthSource: BN7PR04MB4388.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Nov 2021 20:06:35.3743 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 5d7e4366-1b9b-45cf-8e79-b14b27df46e1 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: eK00Dxoo0d7xsu0qTRKPwFiDUthEn3jWSTfKbg10BWjadwedPZPbrYa6ANjQ2MhC0idOftyWSC6Ad2pjAK/C4g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR04MB6371 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:219792 Archived-At: On 11/12/2021 2:26 PM, Eli Zaretskii wrote: >> Date: Fri, 12 Nov 2021 13:22:28 -0500 >> Cc: yamaoka@jpl.org, 51734@debbugs.gnu.org >> From: Ken Brown >> >> The only thing I can think of is that Cygwin is probably the only system that >> has timerfd and that also has to use timers to poll for input. (The others all >> use SIGIO, if I'm not mistaken.) By using two different kinds of timers >> simultaneously, we're getting timers expiring twice as often and not at regular >> intervals. Could this account for the slowdown? > > At what frequency does the other timer tick, the one used to poll for > input? They're both used to poll for input, and both at the same frequency (I think every second). For systems without SIGIO, keyboard.c:start_polling creates an atimer "poll_timer" via a call to start_atimer. The latter calls set_alarm, which now (after commit 858868e3) calls both timerfd_settime and timer_settime. So we have both a timerfd and a POSIX timer, both serving the same purpose AFAICT. When I said "not at regular intervals" above, I meant that there will sometimes be delays before Emacs notices a timer expiring, so the two timers will get out of phase with another. I hope this makes some sense. I find keyboard.c and the whole alarm setup confusing, so I could easily have gotten some things wrong. >> In any case, I think I should go ahead and install the patch to make the master >> branch usable again on Cygwin. > > Feel free. Done, and I'm closing the bug. Ken