Operating Systems - Round Robin Scheduling - Quantum & Turnaround Time
When the time quantum in Round Robin scheduling is set to a very large value, close to the longest CPU burst, what is the expected effect on system performance?
When the time quantum in Round Robin scheduling is set to a very large value, close to the longest CPU burst, what is the expected effect on system performance?
medium🧠 Conceptual Q6 of Q15
Step-by-Step Solution
Solution:
Step 1: Analyze large quantum effect
A large quantum means processes run almost to completion before switching.Step 2: Compare to FCFS
This behavior mimics First-Come-First-Serve scheduling, where short processes may wait longer.Step 3: Evaluate other options
B is false because fairness decreases; C is false as context switches reduce; D is false since preemptions are rare.Final Answer:
Option C -> Option CQuick Check:
Large quantum -> fewer switches -> FCFS-like behavior [OK]
Quick Trick: Large quantum approximates FCFS, hurting short jobs [OK]
Common Mistakes:
MISTAKES- Assuming fairness improves with large quantum
- Thinking context switches increase with large quantum
- Believing short processes finish faster
Trap Explanation:
PITFALL- Large quantum reduces context switches and fairness, opposite of some distractors.
Interviewer Note:
CONTEXT- Tests understanding of how quantum size affects scheduling behavior and turnaround.
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