Operating Systems - Round Robin Scheduling - Quantum & Turnaround Time
What is the main disadvantage of choosing an extremely small time quantum in Round Robin scheduling?
What is the main disadvantage of choosing an extremely small time quantum in Round Robin scheduling?
medium🧠 Conceptual Q5 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand small quantum effect
A very small quantum causes the CPU to switch between processes frequently.Step 2: Identify consequence
Frequent context switches increase overhead, reducing CPU efficiency.Step 3: Evaluate other options
B is incorrect because small quantum usually reduces waiting time; C is false as longer bursts take more quanta; D is false because small quantum improves fairness.Final Answer:
Option C -> Option CQuick Check:
Small quantum -> more switches -> overhead ↑ [OK]
Quick Trick: Smaller quantum means more context switches [OK]
Common Mistakes:
MISTAKES- Assuming small quantum increases waiting time
- Believing longer bursts finish faster with small quantum
- Confusing fairness impact
Trap Explanation:
PITFALL- Small quantum reduces waiting time and improves fairness, so those options are incorrect.
Interviewer Note:
CONTEXT- Tests knowledge of trade-offs in choosing time quantum size.
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