Operating Systems - Round Robin Scheduling - Quantum & Turnaround Time
If a system uses Round Robin scheduling but processes have widely varying I/O wait times, what modification can improve overall turnaround time without sacrificing fairness?
If a system uses Round Robin scheduling but processes have widely varying I/O wait times, what modification can improve overall turnaround time without sacrificing fairness?
hard🎤 Interviewer Follow-up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand impact of I/O wait variability
Processes with frequent I/O waits may block often, causing inefficient CPU usage.Step 2: Analyze options
B is incorrect because increasing quantum may reduce responsiveness; C loses fairness and preemption benefits; D starves I/O-bound processes.Step 3: Choose dynamic quantum
A implements dynamic quantum adjustment based on process I/O behavior, improving turnaround and fairness.Final Answer:
Option B -> Option BQuick Check:
Dynamic quantum adapts to I/O patterns [OK]
Quick Trick: Dynamic quantum adapts to I/O wait variability [OK]
Common Mistakes:
MISTAKES- Ignoring I/O wait impact
- Assuming fixed quantum suffices
Trap Explanation:
PITFALL- Candidates often overlook process behavior variability affecting scheduling efficiency.
Interviewer Note:
CONTEXT- Probes advanced understanding of Round Robin tuning for mixed I/O workloads.
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