GATE CS 2021 Set 2 — Question 24
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Operating System → Process Scheduling → Round Robin
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Question
Which of the following statement(s) is/are correct in the context of CPU scheduling?
Correct answer
(A) Turnaround time includes waiting time.; (C) Round-robin policy can be used even when the CPU time required by each of the processes is not known apriori.; (D) Implementing preemptive scheduling needs hardware support.
Solution
1.Turnaround Time: Defined as the total time from process submission to completion. . Thus, it includes waiting time. Statement (A) is correct.
2.Scheduling Goals: The primary goals are to maximize CPU utilization and maximize throughput, while minimizing turnaround, waiting, and response times. Statement (B) is incorrect because it mentions minimizing throughput.
3.Round-Robin (RR): RR is a preemptive algorithm that uses a fixed time quantum. It does not require prior knowledge of the burst time (CPU time required) of processes. Statement (C) is correct.
4.Hardware Support: Preemptive scheduling requires a hardware timer to generate interrupts at the end of a time slice to return control to the scheduler. Statement (D) is correct.
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