Operating Systems - Round Robin Scheduling - Quantum & Turnaround Time
Trace the sequence of events when a process's CPU burst exceeds the time quantum in Round Robin scheduling. What happens immediately after the quantum expires?
Trace the sequence of events when a process's CPU burst exceeds the time quantum in Round Robin scheduling. What happens immediately after the quantum expires?
easy🧠🧾 Concept Trace Q12 of Q15
Step-by-Step Solution
Step 1: Recall Round Robin preemption
When a process's time quantum expires, it is preempted to ensure fairness and allow other processes CPU access.Step 2: Understand queue management
The preempted process is placed at the end of the ready queue to wait for its next turn.Step 3: Analyze incorrect options
The process continues running until it voluntarily yields the CPU contradicts RR's preemption principle. The process is terminated and removed from the system is incorrect because process termination depends on completion, not quantum expiry. The process is moved to the waiting queue for I/O is incorrect unless the process requests I/O, which is unrelated to quantum expiration.Final Answer:
Option A -> Option AQuick Check:
Quantum expiry -> preempt -> enqueue at ready queue's end.
Quick Trick: Quantum expiry means preempt and requeue
Common Mistakes:
MISTAKES- Thinking process runs until completion ignoring quantum
- Confusing preemption with process termination
- Assuming process moves to waiting queue without I/O
Trap Explanation:
PITFALL- Option B is tempting because some may think processes run until done. Option D confuses I/O wait with quantum expiry. Option C confuses termination with preemption.
Interviewer Note:
CONTEXT- Tests understanding of Round Robin's preemption and queue management after quantum expiration.
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