Operating Systems - FCFS Scheduling - Convoy Effect & Waiting Time
If FCFS scheduling is extended to a multi-core system without process migration, what is a major challenge that can worsen the convoy effect?
If FCFS scheduling is extended to a multi-core system without process migration, what is a major challenge that can worsen the convoy effect?
hard🎤 Interviewer Follow-up Q10 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand FCFS in multi-core without migration
Processes assigned to cores statically may cause load imbalance.Step 2: Analyze impact
Some cores may be idle while others have long processes blocking short ones, worsening convoy effect.Step 3: Evaluate options
A: Incorrect, convoy effect worsens due to load imbalance.
B: Incorrect, migration is not allowed.
C: Incorrect, no automatic balancing without migration.
D: Correct, processes stuck on one core increase waiting time.Final Answer:
Option B -> Option BQuick Check:
Static core assignment causes load imbalance and convoy effect [OK]
Quick Trick: No migration causes load imbalance, worsening convoy effect [OK]
Common Mistakes:
MISTAKES- Assuming multi-core eliminates convoy effect
- Believing process migration is automatic
- Thinking FCFS balances load across cores
Trap Explanation:
PITFALL- Candidates often overlook load imbalance without migration, wrongly assuming parallelism solves convoy effect.
Interviewer Note:
CONTEXT- Probes understanding of FCFS limitations in multi-core environments and load balancing.
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