Operating Systems - FCFS Scheduling - Convoy Effect & Waiting Time
Which of the following statements about the convoy effect in FCFS scheduling is INCORRECT?
Which of the following statements about the convoy effect in FCFS scheduling is INCORRECT?
medium🐞 Bug Identification Q14 of Q15
Step-by-Step Solution
Step 1: Analyze each statement
A is correct; long processes delaying short ones is the convoy effect.
B is correct; preemption can reduce the convoy effect.
C is incorrect; the convoy effect increases average waiting time, not minimizes it.
D is correct; convoy effect can cause poor CPU utilization and longer waits.Step 2: Identify the incorrect statement
Only The convoy effect causes the average waiting time to always be minimal in FCFS falsely claims minimal average waiting time due to the convoy effect.Final Answer:
Option C -> Option CQuick Check:
Convoy effect worsens waiting time, not improves it.
Quick Trick: Convoy effect -> longer waits, not shorter
Common Mistakes:
MISTAKES- Assuming convoy effect improves waiting time
- Ignoring preemption as a mitigation
- Misunderstanding convoy effect impact on CPU utilization
Trap Explanation:
PITFALL- Option C is tempting because candidates may confuse the term 'effect' with a positive outcome. Options A, B, and D are true and align with standard OS knowledge.
Interviewer Note:
CONTEXT- Tests candidate's ability to spot misconceptions about the convoy effect in FCFS.
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