From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: asparagus@comcast.net Newsgroups: gmane.emacs.bugs Subject: bug#19896: 23.1; reverse-region is slow compared to sort-columns Date: Wed, 18 Feb 2015 17:35:42 +0000 (UTC) Message-ID: <758739999.5853607.1424280942368.JavaMail.zimbra@comcast.net> References: <1372534272.5818344.1424278471675.JavaMail.zimbra@comcast.net> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Trace: ger.gmane.org 1424282369 3520 80.91.229.3 (18 Feb 2015 17:59:29 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Wed, 18 Feb 2015 17:59:29 +0000 (UTC) To: 19896@debbugs.gnu.org Original-X-From: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Wed Feb 18 18:59:15 2015 Return-path: Envelope-to: geb-bug-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1YO8tz-0007fB-IO for geb-bug-gnu-emacs@m.gmane.org; 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reverse-region is slow compared to sort-columns Thread-Index: lbzmDaZofEhJji7JTNkWY0yfc0g5ng== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=comcast.net; s=q20140121; t=1424280942; bh=xZdwCwF+ADlYFADx7RJzMU/W0xCi6p/ULGEDFLkg/HY=; h=Received:Received:Date:From:To:Message-ID:Subject:MIME-Version: Content-Type; b=BarUg0oO/PqHtm2LGmVEWqdcEvpUuQMey6V+0qOM++knltemxwHkvh5HQJ6o06LGk Z6zm2+RUGAQAzC9PRvwF61DEMMchPyj6uvQWtvzr/D12FSmD2KN8yiSDLSLSJaW4bw wGR4lFt264gWPNuMzkFKNuFyrVhSeKQ3WJjAsy9d6Mru0YNueBSqxCrzDyll7b1Iv4 FXLmf1ruh3lt83WCXFXYCpb9/wekDhfGfLGPmPAJzev2oPYW8HTcZPRlyh0R3+mYcT cCUqHCsQKKTVVR9aLgn/qRx+uLl415p8Ah09v8a8c8aTMtgTXCZAPYZDMW88K4Hj6F 7Bcwe9I9gLGOQ== X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: Error: Malformed IPv6 address (bad octet value). X-Mailman-Approved-At: Wed, 18 Feb 2015 12:58:09 -0500 X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.15 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 140.186.70.43 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.org@gnu.org Original-Sender: bug-gnu-emacs-bounces+geb-bug-gnu-emacs=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.bugs:99549 Archived-At: The emacs manual recommends 'M-x reverse-region' as a companion to 'M-x sort-columns' to achieve a descending-order column sort. However, for large regions (>100k lines), 'M-x reverse-region' is noticeably slower than 'M-x sort-columns', making descending sort much slower than ascending sort. A workaround on linux: use 'C-u M-x shell-command-on-region' with tac (the opposite of cat) instead of using 'M-x reverse-region'. FROM THE MANUAL: https://www.gnu.org/software/emacs/manual/html_node/emacs/Sorting.html M-x reverse-region Reverse the order of the lines in the region. This is useful for sorting into descending order by fields or columns, since those sort commands do not have a feature for doing that.