From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from holgerdanske.com (holgerdanske.com [IPv6:2001:470:0:19b::b869:801b]) by sourceware.org (Postfix) with ESMTPS id 9E6C2384B07C for ; Tue, 24 May 2022 15:03:46 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 9E6C2384B07C Authentication-Results: sourceware.org; dmarc=pass (p=none dis=none) header.from=holgerdanske.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=holgerdanske.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=holgerdanske.com; s=nov-20210719-112354; t=1653404623; bh=EAR+e4MP344i1evKxLfhCQIlTUFF8epg1zW3n35aB2k=; h=Received:Message-ID:Date:MIME-Version:User-Agent:Subject: Content-Language:To:References:From:In-Reply-To:Content-Type: Content-Transfer-Encoding; b=VsUC/n+B4JTA+kAO2TlBseemF8bWco6xt1IRB54Tw1PgPAuoJssnkUm9gKp3ONbnG X94Px3SdEVZM0I9pPtFu5rMy8jPnVgGXPW9c7VytYKqatoXCGtKc8Zzk4yKxT4s+6W 9be5TOgFppvdj1jST5tFYKGvZOzhbifXTCn56TmEvfp1Mz+AnzrrdExjzejRWttE+a 0OWY5p3weMgHWNlZWwVj/xgOCZ67cu3rVXbx8kiFGyisSc+H/q/ZcqHGOMYaO/Z54a JMGubz5upHfqZvhafhAnUom7RsdDHdysjigWi75LDwz47EhtzeAXVWVfvJI0oQiFeh 5v+99PkY1E7nkc0WzvB2nPBSEfsDHSLSx69VJ0EG2jb0rRXopTbfeEs2xGg66yDupm UJhFCDxgrwM5O3I1QY8T6aaYW0kh3x+riV4hMs/Y66AS2yUnUgV6uKxSvkeeaTvdC1 qyPav6VKDLsX5UXa7jOK8q73MVIvudJk7nlCSvF4dCVcd4owqtzXtJexKm5YuNWl+V kxcpdb/GGL4JGE5FW213VCtZaM1BdlcaMsDhvOIcxe2+6SaRZ+Q6BYM+PG405lBu2Y GeAZR5ZFGUn7f1pINvWqrT+W8uHF+65c7bj/xtF2zqw2BIC7F8vOIaY31dXZWTxPQj PVRbu5XlZuMZ1zUqOnJky+LU= Received: from 99.100.19.101 (99-100-19-101.lightspeed.frokca.sbcglobal.net [99.100.19.101]) by holgerdanske.com with ESMTPSA (TLS_AES_128_GCM_SHA256:TLSv1.3:Kx=any:Au=any:Enc=AESGCM(128):Mac=AEAD) (SMTP-AUTH username dpchrist@holgerdanske.com, mechanism PLAIN) for ; Tue, 24 May 2022 08:03:43 -0700 Message-ID: Date: Tue, 24 May 2022 08:03:43 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.0 Subject: Re: Cygwin Perl has slowed in recent months Content-Language: en-US To: cygwin@cygwin.com References: <9a24b87b-e71d-9371-5d78-2b0f160adacd@holgerdanske.com> <69f7b5b2-0730-bce2-90d8-95a7fde0a15f@t-online.de> From: David Christensen In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-3.1 required=5.0 tests=BAYES_00, BODY_8BITS, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, NICE_REPLY_A, SPF_HELO_PASS, 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: Tue, 24 May 2022 15:03:48 -0000 On 5/24/22 01:47, Sam Edge wrote: > On 24/05/2022 09:25, Csaba Raduly wrote: > > On Mon, 23 May 2022 at 20:47, Lee  wrote: > >> > >> On 5/22/22, David Christensen wrote: > >>> On 5/21/22 10:55, Hans-Bernhard Bröker wrote: > >>>> Am 18.05.2022 um 03:53 schrieb David Christensen: > >>>> > >>>>  > I am working on a Perl module that runs on various Unix-like > platforms. > >>>>  > When I 'make test' on similar computers: > >>>>  > > >>>>  > FreeBSD 12.3-RELEASE         28 wallclock secs > >>>>  > Debian GNU/Linux 11.3          31 wallclock secs > >>>>  > macOS 11.6.2              36 wallclock secs > >>>>  > Windows 7 / Cygwin 3.3.5-1    509 wallclock secs > >>>> > >>>> Given the complete lack of information about what that Perl module of > >>>> yours might be doing, that's hard to have a meaningful discussion > about. > >>> > >>> > >>> Thank you for the response.  I was hoping there was a known issue. > >>> Apparently, not. > >> > >> What I consider a well known issue is that process start up time is > >> _very_ slow.  If your  'make test' starts lots of processes that could > >> be a problem. > >> > > > > While Cygwin''s fork emulation is indeed  slow (I once measured 1000:1 > > between Cygwin and Linux  * ), > > "make test" likely started roughly the same number of processes "then" > > as it does  "now". > > In  which case the increase in the run time could be attributed to > Cygwin. > > Indeed. > > But perhaps what the Cygwin core and/or Cygwin Perl maintainers need is a > simple test case Perl script that can be shown to be much slower on the > current > releases than it was on a named earlier pair of releases. And maybe some > testing by the original poster to see if it is the Cygwin or Perl release > change that causes the issue. > > Anecdotal observations do not an issue report make. ;-) So, we are discussing running a Perl benchmark for various combinations of Cygwin version and/or Cygwin Perl version. That is an O(n) and/or O(n**2) problem. If multiple benchmarks are considered, increase the O() exponent by one. If multiple versions of Windows are considered, increase the O() exponent by one. If multiple computers are considered, increase the O() exponent by one. Does the Cygwin project do any of the above? If so, how? Where are the test plans and assets? Where is the raw data? Where are the reports? If end users are expected to do the above, please advise: 1. How to install multiple versions of Cygwin on Windows 7 Professional 64-bit Service Pack 1 on an x86_64 computer such that each instance of Cygwin does not interact with any other instance of Cygwin. 2. How to install multiple versions of Cygwin Perl on each of many Cygwin installations on Windows 7 Professional 64-bit Service Pack 1 on an x86_64 computer such that each instance of Cygwin Perl does not interact with any other instance of Cygwin Perl or Cygwin. 3. What is a suitable Perl benchmark? David