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 512E4385C017 for ; Thu, 19 Mar 2020 10:14:55 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 512E4385C017 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=cs.umass.edu Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=moss@cs.umass.edu Received: from [150.203.106.61] (dhcp-liversidge61.anu.edu.au [150.203.106.61]) by mailsrv.cs.umass.edu (Postfix) with ESMTPSA id 153EA401C1A0; Thu, 19 Mar 2020 06:14:53 -0400 (EDT) Reply-To: moss@cs.umass.edu Subject: Re: Why is taskset still not in util-linux? To: Mark Geisert , cygwin@cygwin.com References: <1348011a-261a-2a87-d361-4e51fa8dc19f@cs.umass.edu> <85ae12aa-6cc3-5d4c-5df2-25bf811ec6a9@maxrnd.com> <72fea68a-b3d7-e87c-726f-8a5a2587a992@maxrnd.com> From: Eliot Moss Message-ID: <01e3d337-e5fe-f393-7634-3f1881bca315@cs.umass.edu> Date: Thu, 19 Mar 2020 06:14:51 -0400 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <72fea68a-b3d7-e87c-726f-8a5a2587a992@maxrnd.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=0.0 required=5.0 tests=KAM_DMARC_STATUS, SPF_HELO_NONE, SPF_PASS autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Cygwin mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 19 Mar 2020 10:14:59 -0000 On 3/16/2020 7:34 PM, Mark Geisert wrote: > Mark Geisert wrote: >> Eliot Moss wrote: >>> >>> Dear cygwin-ers -- >>> >>> Something I had asked about a while ago was the absence os taskset in cygwin's >>> util-linux. At the time, it was pointed out that the necessary get/set >>> affinity library/system calls were not yet supported. These were added a >>> while ago, so it would seem that taskset ought to work. In fact, I think >>> someone got it going on their own. Can we add it to util-linux now, >>> officially? I think this was intended but perhaps was overlooked or >>> something. >> >> Report noted; thanks. A solution is being worked. > > There's been no forward progress on this. If you're comfortable getting the util-linux source > package through Cygwin setup*.exe, you can follow the steps shown in > https://cygwin.com/pipermail/cygwin-apps/2020-March/039855.html to build (with cygport) a local copy > of util-linux that includes a taskset.exe you can move into /usr/local/bin, for example. > > You might try that route if you're up for it. Feel free to ask questions here if you hit a snag. > HTH, Thank you, Mark. I decided to give it a try and got some distance, but hit a snag. First, I had to change configure.ac to add control to disable ionice (Cygwin does not support a required syscall) while still trying to build taskset. Previously taskset and ionice (and one other program) were controlled by the single --enable-schedutils. Now, including sched.h does not provide the prototypes for sched_getaffinity, etc. I found a previous post that suggests we need to do -D_GNU_SOURCE for it to work. I am not sure of the best place to stick that, but I will see about maybe a one line patch to taskset.c or something. Regards - Eliot