Operating Systems - Round Robin Scheduling - Quantum & Turnaround Time
A candidate claims that increasing the time quantum in Round Robin scheduling always decreases the average turnaround time. What is the flaw in this reasoning?
A candidate claims that increasing the time quantum in Round Robin scheduling always decreases the average turnaround time. What is the flaw in this reasoning?
medium🐞 Bug Identification Q7 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze impact of increasing quantum
Larger quantum reduces preemption, causing short processes to wait longer.Step 2: Evaluate candidate's claim
Claim ignores that longer waiting for short processes can increase average turnaround.Step 3: Analyze options
A is unrelated to the flaw; B is unrelated to turnaround time effect; C is a different metric; D correctly identifies the flaw.Final Answer:
Option D -> Option DQuick Check:
Large quantum can increase waiting for short processes [OK]
Quick Trick: Large quantum can hurt short process turnaround [OK]
Common Mistakes:
MISTAKES- Assuming bigger quantum always improves turnaround
- Mixing turnaround with response time
Trap Explanation:
PITFALL- Candidates overlook waiting time increase for short processes with large quantum.
Interviewer Note:
CONTEXT- Tests ability to spot subtle misconceptions about quantum size effects.
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