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 13:22:28 -0500 Message-ID: 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> 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="33013"; 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: yamaoka@jpl.org, 51734@debbugs.gnu.org To: Eli Zaretskii Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Fri Nov 12 19:23:11 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 1mlbCh-0008J0-Bl 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)(6486002)(5660300002)(2906002)(75432002)(4326008)(31696002)(6916009)(8936002)(53546011)(16576012)(36756003)(66556008)(66476007)(956004)(4744005)(38100700002)(26005)(316002)(786003)(66946007)(2616005)(186003)(31686004)(83380400001)(8676002)(86362001)(508600001)(43740500002)(45980500001); DIR:OUT; SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 bAUmFcQA8DkZ4C4xo7UzohaszwkfmhyW8FOYeOX59C1I2X+CXkNKZU3XIWc2qCOqXKJeko+I/eBBbvE453a5GSKO/oS8rCluKd X-OriginatorOrg: cornell.edu X-MS-Exchange-CrossTenant-Network-Message-Id: 2849f0d4-0745-40ca-b350-08d9a6096331 X-MS-Exchange-CrossTenant-AuthSource: BN7PR04MB4388.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Nov 2021 18:22:29.9943 (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: 38Wamtzpb21VK7tWKlduPaithtAF1umlNkc1xwKc3S3DOZdZOxN5YcVg8+aunYzogewCFTLoyVyA2GTqh93I3g== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN8PR04MB5955 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:219783 Archived-At: On 11/11/2021 3:36 PM, Eli Zaretskii wrote: > LGTM, thanks. It would be good to understand why starting alarms > causes slowdown on Cygwin, though. I asked on the cygwin-developers list, and Corinna is not aware of any reason there should be a problem using timerfd and POSIX timers simultaneously. [In case it wasn't clear, the slowdown occurs only if we use both timerfd and alarms; either one by itself is fine.] 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? In any case, I think I should go ahead and install the patch to make the master branch usable again on Cygwin. Ken