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5-sol - CHAPTER 5 CPU Scheduling Practice Exercises 5.1 A...

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5 C H A P T E R CPU Scheduling Practice Exercises 5.1 A CPU scheduling algorithm determines an order for the execution of its scheduled processes. Given n processes to be scheduled on one proces- sor, how many possible different schedules are there? Give a formula in terms of n . Answer: n! ( n factorial = n × n – 1 × n – 2 × ... × 2 × 1). 5.2 Define the difference between preemptive and nonpreemptive schedul- ing. Answer: Preemptive scheduling allows a process to be interrupted in the midst of its execution, taking the CPU away and allocating it to another process. Nonpreemptive scheduling ensures that a process relinquishes control of the CPU only when it finishes with its current CPU burst. 5.3 Suppose that the following processes arrive for execution at the times indicated. Each process will run the listed amount of time. In answering the questions, use nonpreemptive scheduling and base all decisions on the information you have at the time the decision must be made. Process Arrival Time Burst Time P 1 0.0 8 P 2 0.4 4 P 3 1.0 1 a. What is the average turnaround time for these processes with the FCFS scheduling algorithm?
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