Operating Systems - FCFS Scheduling - Convoy Effect & Waiting Time
In a system where a long CPU-bound process arrives first, followed by many short I/O-bound processes, which scheduling approach better mitigates the convoy effect?
In a system where a long CPU-bound process arrives first, followed by many short I/O-bound processes, which scheduling approach better mitigates the convoy effect?
hard⚖️ Approach Comparison Q8 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand convoy effect mitigation
Convoy effect delays short processes behind long ones in FCFS.Step 2: Analyze options
A: FCFS does not mitigate convoy effect.
B: Prioritizing long processes worsens convoy effect.
C: Round Robin preempts long processes, giving short ones CPU slices early.
D: FCFS with aging still processes in arrival order, less effective than preemption.Final Answer:
Option B -> Option BQuick Check:
Round Robin reduces convoy effect via time slicing [OK]
Quick Trick: Preemption in Round Robin reduces convoy effect [OK]
Common Mistakes:
MISTAKES- Assuming FCFS is always fair
- Believing priority scheduling favors short processes
- Thinking aging alone solves convoy effect in FCFS
Trap Explanation:
PITFALL- Candidates often overlook preemption's role in reducing convoy effect, wrongly favoring FCFS fairness.
Interviewer Note:
CONTEXT- Tests ability to apply scheduling concepts to edge cases and trade-offs.
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