Question

Briefly explain two events that might cause a job to be moved to another queue under a Movement Between Queues policy, and describe the movement that would occur.

Answer 1

Events:

• when properties/characteristics of a job change between CPU-intensive and I/O intensive, then there is the possibility to switch a job from one queue to another.
• Aging can also be incorporated, in which a longly waited job can get bumped up into a higher priority queue for some time.

----------------------------------------------------------------------------------------

In first event, for an I/O intensive job, we can shift the job from high priority queue to low priority queue. For an CPU intensive job, we can shift the job from low priority queue to high priority queue.

second event happens when an algorithm has been waiting for a long time to get its turn to complete execution, In this case, we move the job from low priority queue to high priority.

-------------------------------------------------------------------------------------------

PLEASE UPVOTE.