And that is precisely why I asked the question: To get people thinking about how this might show up instrumentation. (And no I didn't think there was a dummy LPAR.)
Cheers, Martin Martin Packer zChampion, Systems Investigator & Performance Troubleshooter, IBM +44-7802-245-584 email: martin_pac...@uk.ibm.com Twitter / Facebook IDs: MartinPacker Blog: https://www.ibm.com/developerworks/mydeveloperworks/blogs/MartinPacker Podcast Series (With Marna Walle): https://developer.ibm.com/tv/mpt/ or https://itunes.apple.com/gb/podcast/mainframe-performance-topics/id1127943573?mt=2 Youtube channel: https://www.youtube.com/channel/UCu_65HaYgksbF6Q8SQ4oOvA From: Jim Mulder <d10j...@us.ibm.com> To: IBM-MAIN@LISTSERV.UA.EDU Date: 04/03/2019 15:39 Subject: Re: CPU time and zIIP Sent by: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> There is no "dummy LPAR". Millicode periodically executes a loop to waste some time. The logical processor remains dispatched to the physical processor while that is happening, so the wasted time is included in the CPU Timer for the logical processor, and thus is charged to the dispatched work unit, as it should be. Jim Mulder z/OS Diagnosis, Design, Development, Test IBM Corp. Poughkeepsie NY > It is simple: clock remains the same for any subcapacity. Simply some > cycles are taken by "dummy LPAR". > How does it relate to CPI? It does not affect... ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN Unless stated otherwise above: IBM United Kingdom Limited - Registered in England and Wales with number 741598. Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
