From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.io!.POSTED.blaine.gmane.org!not-for-mail From: Stefan Monnier Newsgroups: gmane.emacs.devel Subject: Re: ido-switch-buffer is slow with many buffers; others are fast Date: Sat, 14 Nov 2020 13:22:18 -0500 Message-ID: References: <87ima7nbic.fsf@catern.com> Mime-Version: 1.0 Content-Type: text/plain Injection-Info: ciao.gmane.io; posting-host="blaine.gmane.org:116.202.254.214"; logging-data="28787"; mail-complaints-to="usenet@ciao.gmane.io" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) Cc: emacs-devel@gnu.org To: catern@catern.com Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane-mx.org@gnu.org Sat Nov 14 19:23:26 2020 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 1ke0Cs-0007Nw-TR for ged-emacs-devel@m.gmane-mx.org; Sat, 14 Nov 2020 19:23:26 +0100 Original-Received: from localhost ([::1]:58352 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ke0Cr-0005l0-V0 for ged-emacs-devel@m.gmane-mx.org; Sat, 14 Nov 2020 13:23:25 -0500 Original-Received: from eggs.gnu.org ([2001:470:142:3::10]:35232) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ke0Bs-0004tV-9U for emacs-devel@gnu.org; Sat, 14 Nov 2020 13:22:24 -0500 Original-Received: from mailscanner.iro.umontreal.ca ([132.204.25.50]:36210) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ke0Bp-0007Ul-U4 for emacs-devel@gnu.org; Sat, 14 Nov 2020 13:22:23 -0500 Original-Received: from pmg3.iro.umontreal.ca (localhost [127.0.0.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id 1701744106E; Sat, 14 Nov 2020 13:22:20 -0500 (EST) Original-Received: from mail01.iro.umontreal.ca (unknown [172.31.2.1]) by pmg3.iro.umontreal.ca (Proxmox) with ESMTP id D4FE5440F4B; Sat, 14 Nov 2020 13:22:18 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=iro.umontreal.ca; s=mail; t=1605378138; bh=TQ450Je4UJi0CWH5yj0tgrY1mupJtIgQFb17XFukrx8=; h=From:To:Cc:Subject:References:Date:In-Reply-To:From; b=mMASs5+tJRShuMUp7vA4DvFaimyfqqodER3R6SE1nmgfqK3SCYOB/1vYg7FyYewpK Nb32mA4LatCUNu84d4H0JyXUh1Tqwu/+4Wv+ExtnH30JOXZxnEV3ZfhIB/MlWi5XL5 2lrghJpzkqeORhFxd+2jh3Rk0P0OoG/39/hop90iQHOXs/wN/xkETWPtsVcvbuwcOe LnTQ5EE/+hm67Ol3fIzIepQxr2lRhh9VcbjNCIflllErErc1DoCaTPVdIVvTbfmWuY PetzcSRBwedQ3NfF/Xn00pu5sH1iDmzTjZV9U5tBLA11utzLxQd5Wb937R+qTO8F2e dbpu4b5/epkAg== Original-Received: from alfajor (unknown [157.52.9.240]) by mail01.iro.umontreal.ca (Postfix) with ESMTPSA id 872AA120246; Sat, 14 Nov 2020 13:22:18 -0500 (EST) In-Reply-To: <87ima7nbic.fsf@catern.com> (catern@catern.com's message of "Sat, 14 Nov 2020 11:34:03 -0500") Received-SPF: pass client-ip=132.204.25.50; envelope-from=monnier@iro.umontreal.ca; helo=mailscanner.iro.umontreal.ca X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/14 12:55:53 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=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:259177 Archived-At: > I recently became annoyed enough in my 1000-buffer Emacs instance to > start profiling things. [...] > It appears that the slowness is completely due to ido building a list of > all buffers in ido-make-buffer-list-1. This function calls > ido-ignore-item-p on every buffer, which checks buffer names against a > regex to ignore ones with leading spaces, which seems to be fairly slow. With current processing power, I find it strange that filtering with a single regexp on a 1000-element list should take a whole second. IOW, I suspect that there's more to it than that (e.g. an inefficient regexp, or some other cost somewhere). > This is a bit unfortunate since iswitchb-mode has been deprecated in > favor of ido-mode. Actually, it was deprecated in favor of icomplete-mode. > There have been many proposals to turn ido on by default in Emacs. I can't remember such proposals, at least not in the last 10 years or so. > Alas, given the current state of ido's performance, it seems to me to be > clearly unacceptable to turn ido on by default. `ido-mode` is barely being maintained, I wouldn't recommend it. Stefan