On 9/29/2016 10:17 AM, Peter Hunkeler wrote:
So there should be enough spare capacity for the system (LPAR) to to use. But it does not. The 7 vertical low CPs are mostly parked or unparked for only a few percent. I wonder why MVS is not using more CPs and more Capacity for that job.
You have to dig into queuing theory, arrival rate, arrival pattern, and service duration of the work to understand why RMF is reporting CPU delay samples yet WLM does not unpark processors to run it.
HiperDispatch is a balancing act between providing the best processor efficiency vs dispatch responsiveness. If the average CPU utilization of the 3 CPUs is not relatively high *and* the delay for work to get dispatched is small, such that the cost/delay of using the vertical low CPUs is believed to not be worth it, then the vertical low CPUs will not be unparked.
You can always try turning HiperDispatch off and see what happens. Regards, Greg ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
