A multiprocessor with eight processors has 20 attached tape drives. There are a large number of jobs
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a. Assume the scheduler in the OS will not start a job unless there are four tape drives available. When a job is started, four drives are assigned immediately and are not released until the job finishes. What is the maximum number of jobs that can be in progress at once? What are the maximum and minimum number of tape drives that may be left idle as a result of this policy?
b. Suggest an alternative policy to improve tape drive utilization and at the same time avoid system deadlock. What is the maximum number of jobs that can be in progress at once? What are the bounds on the number of idling tape drives?
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Related Book For
Computer organization and architecture designing for performance
ISBN: 978-0136073734
8th edition
Authors: william stallings
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