From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Daniel Colascione Newsgroups: gmane.emacs.devel Subject: Re: cc-mode fontification feels random Date: Fri, 11 Jun 2021 11:02:34 -0700 Message-ID: References: <62e438b5-d27f-1d3c-69c6-11fe29a76d74@dancol.org> <83fsxsdxhu.fsf@gnu.org> <83pmwudgw3.fsf@gnu.org> <83k0n2cjg5.fsf@gnu.org> <83im2lbqmv.fsf@gnu.org> <179f6e4fa40.2816.cc5b3318d7e9908e2c46732289705cb0@dancol.org> <83fsxpbpn9.fsf@gnu.org> <83k0n09tkp.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="14574"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 Cc: rudalics@gmx.at, emacs-devel@gnu.org, monnier@iro.umontreal.ca, rms@gnu.org To: Eli Zaretskii , Alan Mackenzie Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Fri Jun 11 20:06:03 2021 Return-path: Envelope-to: ged-emacs-devel@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 1lrlXf-0003XF-2N for ged-emacs-devel@m.gmane-mx.org; Fri, 11 Jun 2021 20:06:03 +0200 Original-Received: from localhost ([::1]:40192 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lrlXc-0001yL-U1 for ged-emacs-devel@m.gmane-mx.org; Fri, 11 Jun 2021 14:06:01 -0400 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:45916) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lrlUS-0001D6-RM for emacs-devel@gnu.org; Fri, 11 Jun 2021 14:02:46 -0400 Original-Received: from dancol.org ([2600:3c01:e000:3d8::1]:56918) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lrlUQ-0005kU-Ri; Fri, 11 Jun 2021 14:02:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=dancol.org; s=x; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=u4S+v57NdJyXzIq0MszOsnCvZ+Z9gC0W4s92R+OuU9c=; b=GdxioZ0bZnokycVEVT+pAR1gHu JdCaNTNXpy461DBReWFxbh/dscFMhdub+HBMibgf/UlRx9yIaqcKbCg6lpXHDGnhWkOEAyuwn9W2K wVrDbottdj2G58HVuM41AGJUY4K/0bPlOXYi1BgrcIDbdh0DEc2/8446LP+ZOtWmUUI3jcWWL+iX7 Lvm64wO/82Cx+mtTzAAMLbsTUxT6v+z/xCc559em0D1wKqJ1kzvirrixMvd/9TXr4P2ngv4xCi6NX xTHJXNZIif+YgZlzdZaPWTinGk0napIh38O00BEx7XYnvSVL96UGI/qRGLmB0WCVynoehRpltTCjU bnT1DD3A==; Original-Received: from [2600:1012:b02e:3652:8166:6cb4:1287:b413] (port=57798) by dancol.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.89) (envelope-from ) id 1lrlUK-0001BI-Iv; Fri, 11 Jun 2021 11:02:36 -0700 In-Reply-To: <83k0n09tkp.fsf@gnu.org> Content-Language: en-US Received-SPF: pass client-ip=2600:3c01:e000:3d8::1; envelope-from=dancol@dancol.org; helo=dancol.org X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Original-Sender: "Emacs-devel" Xref: news.gmane.io gmane.emacs.devel:270709 Archived-At: On 6/11/21 10:53 AM, Eli Zaretskii wrote: >> Date: Fri, 11 Jun 2021 16:11:19 +0000 >> Cc: Daniel Colascione , rudalics@gmx.at, >> monnier@iro.umontreal.ca, rms@gnu.org, emacs-devel@gnu.org >> From: Alan Mackenzie >> >> I have measured CC Mode's scrolling performance using: >> >> (defmacro time-it (&rest forms) >> "Time the running of a sequence of forms using `float-time'. >> Call like this: \"M-: (time-it (foo ...) (bar ...) ...)\"." >> `(let ((start (float-time))) >> ,@forms >> (- (float-time) start))) >> >> together with >> >> M-: (time-it (scroll-up-window) (sit-for 0)) >> >> on regions of text which are not yet fontified. My window has 65 lines >> of buffer text. Starting at the middle of xdisp.c, I see the following >> timings for the first few scrolls: >> >> 0.026s, 0.025s, 0.026s, 0.078s, 0.026s, 0.027s. >> >> That is, with the exception of the fourth timing, the scroll operation >> takes a little over 1/40 second. >> >> This is in an Emacs-28 compiled with default optimisation, on a 4 >> year-old first generation Ryzen machine. >> >> For me personally, this scrolling speed, in conjunction with >> fast-but-imprecise-scrolling, is acceptable. I also accept there are >> people with slower machines. > I suggest to compare these times with Emacs 23 to see how we > regressed. Regression is acceptable in exchange for correctness so long as absolute performance is adequate. We're not using 80486s anymore.