Typically, OS services like these and it's Unix equivalent sched_yield()
are used in spinlocks.
On 2019-10-18 1:20 AM, Mike Hochee wrote:
Yes exactly, that is part of what WLM is designed to do. In the real world most
shops use WLM service classes and velocity goals to control things like CPU
dispatching frequency. I'm sure there exist workloads which tend to defy the
controls available in WLM, but I suspect they are quite rare. In all but those
rare instances, I'd be inclined to steer clear coding something in a program
for the purpose of getting it re-dispatched for some resource.
My nickels' worth.
Mike
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of Seymour J Metz
Sent: Thursday, October 17, 2019 12:57 PM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: Best way for a task to give up the CPU and let other tasks run?
Caution! This message was sent from outside your organization.
Why? If you are waiting for something then you should use system services,
e.g., ENQ, WAIT, to delay until it occurs; if you are not waiting for something
then why not let the WLM handle what it's designed to handle?
--
Shmuel (Seymour J.) Metz
http://mason.gmu.edu/~smetz3
________________________________________
From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of Thomas
David Rivers <riv...@dignus.com>
Sent: Thursday, October 17, 2019 8:54 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Best way for a task to give up the CPU and let other tasks run?
Does anyone happen to know the best way for a running task to give up running
and let another task run?
But - this isn't "give up" as in ending the task, just giving up the CPU to
allow another task to run and then returning to this task.
Sorta like "I'm done for the moment if something else would like to run".
- Thanks -
- Dave R. -
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