From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 126189 invoked by alias); 13 Apr 2018 14:12:59 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 126176 invoked by uid 89); 13 Apr 2018 14:12:59 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-6.9 required=5.0 tests=BAYES_00,GIT_PATCH_2 autolearn=ham version=3.3.2 spammy=advertised X-HELO: Ishtar.sc.tlinx.org Received: from ishtar.tlinx.org (HELO Ishtar.sc.tlinx.org) (173.164.175.65) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 13 Apr 2018 14:12:57 +0000 Received: from [192.168.3.12] (Athenae [192.168.3.12]) by Ishtar.sc.tlinx.org (8.14.7/8.14.4/SuSE Linux 0.8) with ESMTP id w3DECsL6073571 for ; Fri, 13 Apr 2018 07:12:56 -0700 Message-ID: <5AD0BAE5.2040904@tlinx.org> Date: Fri, 13 Apr 2018 14:12:00 -0000 From: L A Walsh User-Agent: Thunderbird MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: More oddities with multiple processor groups References: <87in8xwre7.fsf@Rainer.invalid> In-Reply-To: <87in8xwre7.fsf@Rainer.invalid> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2018-04/txt/msg00150.txt.bz2 Achim Gratz wrote: > The problem here is that on Linux you don't need to do anything extra to > use any of the advertised logical processors from a single application, > while on Windows you need to first create a thread and set it's affinity > to a different group than where your process was started in, then assign > each new thread an affinity to one of the available groups. If you > don't do that, all threads will be restricted to the original group. ---- Not exactly true. They are not *restricted* -- it's a *feature* of the Windows scheduler, in that future procs/threads inherit the cpu of the parent. Linux's scheduler is more advanced as well as being replaceable. MS doesn't want you to do that > there might > need to be some option to restrict Cygwin to a single processor group > for some applications to work (correctly). --- There is. Start them all on a single cpu & set the cpu mask. Pretty much the same way you restrict procs on linux -- you can run them with a specific cpu mask, and most programs will keep running w/that mask. Unfortunately, AFAIK, I don't think POSIX specifies a way to set affinities, so I'm not sure how cygwin would do it. -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple