From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailsrv.cs.umass.edu (mailsrv.cs.umass.edu [128.119.240.136]) by sourceware.org (Postfix) with ESMTPS id D9A5E3858CDA for ; Mon, 6 Jun 2022 12:34:22 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org D9A5E3858CDA Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=cs.umass.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=cs.umass.edu Received: from [192.168.50.148] (c-24-62-201-179.hsd1.ma.comcast.net [24.62.201.179]) by mailsrv.cs.umass.edu (Postfix) with ESMTPSA id 6DC9E401D75D; Mon, 6 Jun 2022 08:34:22 -0400 (EDT) Reply-To: moss@cs.umass.edu Subject: Re: possible grep V3.7 issue To: Gordon Grimes , "cygwin@cygwin.com" References: From: Eliot Moss Message-ID: Date: Mon, 6 Jun 2022 08:34:23 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.12.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-3.4 required=5.0 tests=BAYES_00, JMQ_SPF_NEUTRAL, KAM_DMARC_STATUS, KAM_SHORT, NICE_REPLY_A, SPF_HELO_NONE, SPF_PASS, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: General Cygwin discussions and problem reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 06 Jun 2022 12:34:27 -0000 On 6/6/2022 8:26 AM, Gordon Grimes via Cygwin wrote: > Hi, > > I wanted to let you know about a possible issue I found in grep v3.7. I run Cygwin and recently downgraded ‘grep’ to v3.6 from v3.7 to address a performance issue (shown below). > I just thought you’d want to know (V3.6 is working well, so I’m in a good place 😊 ) > Enjoy, > -g- > > > % time echo hi | grep h > hi > > real 0m7.442s > user 0m0.030s > sys 0m6.576s > > % /usr/bin/grep --version > grep (GNU grep) 3.7 > Packaged by Cygwin (3.7-2) > Copyright (C) 2021 Free Software Foundation, Inc. > License GPLv3+: GNU GPL version 3 or later https://gnu.org/licenses/gpl.html. > This is free software: you are free to change and redistribute it. > There is NO WARRANTY, to the extent permitted by law. > > Written by Mike Haertel and others; see > https://git.sv.gnu.org/cgit/grep.git/tree/AUTHORS. > > After the downgrade… > > % time echo hi | grep h > hi > > real 0m0.292s > user 0m0.015s > sys 0m0.124s I'm running 3.7-2 and get timing similar to what you give for 3.6: real 0m0.167s user 0m0.015s sys 0m0.061s Not sure what to say unless, if I downgraded, it would be an order of magnitude faster ... I wonder if maybe the new version triggers some anti-virus activity or something like that. Eliot Moss