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On Wednesday, February 4, 2004, at 09:16 AM, Vern Hamberg wrote:
The odd thing to me is that no job runs longer than the internal time
slice, but the activity level is held for it until the end of its
external time slice value, or a long wait.
Perhaps I'm misinterpreting what you wrote above but the previously
quoted IBM document (which was badly worded and seemed confused by its
own numbers) said that if the job has a longer time slice than 500ms
and reached the 500ms boundary (indicating it has not completed its
work) then the CPU would be given to another job but the activity level
of the first job would be held (and its resources remain in main
storage) because the system knows that job has more work to do and it
is still within the user-specified time slice so the job shouldn't lose
its activity level. The activity level is not held if the job has
nothing to do even if it has a long time slice (although job resources
may stay in main storage if main storage is not overcommitted).
It should have been worded as: The activity level of a job is held
until the job reaches the external time slice or a long wait occurs
even though an internal time slice occurs every 500ms (or whatever
actual value is used by current hardware) and the processor may be
given to another job.
Regards,
Simon Coulter.
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