From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Po Lu via "Bug reports for GNU Emacs, the Swiss army knife of text editors" Newsgroups: gmane.emacs.bugs Subject: bug#60810: 30.0.50; `while-no-input' in GUI(macOS) is much slower than emacs -nw Date: Sun, 15 Jan 2023 09:36:24 +0800 Message-ID: <87bkn0bmuf.fsf@yahoo.com> References: Reply-To: Po Lu Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="2022"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Cc: 60810@debbugs.gnu.org To: Allen Wang Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane-mx.org@gnu.org Sun Jan 15 02:37:36 2023 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 1pGrxn-0000LJ-KJ for geb-bug-gnu-emacs@m.gmane-mx.org; 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Hermes SMTP Server) with ESMTPA ID 78d3c895f8ef64d8454e92e4fa129856; Sun, 15 Jan 2023 01:36:44 +0000 (UTC) In-Reply-To: (Allen Wang's message of "Sat, 14 Jan 2023 00:07:31 -0800") X-Mailer: WebService/1.1.21062 mail.backend.jedi.jws.acl:role.jedi.acl.token.atz.jws.hermes.yahoo 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:253402 Archived-At: Allen Wang writes: > Hi maintainers, > > To reproduce, I evaluated these in the scratch buffer. > > (defun sayhi (&rest _) > (while-no-input > (dotimes (_ 10000000) > (random))) > (message "Done.")) > > (add-hook 'post-command-hook 'sayhi) > > After `C-x C-e`-ing the last line, I kept typing some arbitrary text at a normal speed. > > With `emacs -Q -nw`, the last character shows up pretty much immediately after the new key is pressed (as I expect). In GUI, however, there is > significant delay. Say if I type "hello world", then maybe "h" and "e" would show up, then nothing happens for a few seconds, then the rest > would "burst out". > > I'm not sure if this is considered a "bug", so sorry if this isn't the right place to report this. But after looking at documentation and a few other > bug reports, it sounds like people expect `while-no-input' to work in this scenario? Also I see completion packages like Corfu and Vertico wrap > things in this macro in the post-command-hook, and despite them doing that, auto-completion is still quite laggy for me, _only_ when in GUI. If > this is not a bug, where should I submit a feature request? Thanks. This problem is because the NS port does not support interrupt-based input, because of limitations in Apple's toolkit. This means Emacs is not notified immediately about new input while it is executing Lisp, and instead has to periodically check every 1 second. To decrease the amount of time between each check, make `polling-period' smaller. However, that will increase Emacs's CPU usage, even when idle.