Operating Systems - FCFS Scheduling - Convoy Effect & Waiting Time
A candidate claims that FCFS scheduling prevents the convoy effect if all processes have equal CPU burst times. What is the flaw in this reasoning?
A candidate claims that FCFS scheduling prevents the convoy effect if all processes have equal CPU burst times. What is the flaw in this reasoning?
medium🐞 Bug Identification Q7 of Q15
Step-by-Step Solution
Solution:
Step 1: Understand convoy effect
Convoy effect arises when short processes wait behind long ones.Step 2: Analyze equal burst scenario
With equal bursts, waiting still accumulates as processes queue in arrival order.
Delays exist but convoy effect is less severe.Step 3: Evaluate options
A: Incorrect, convoy effect relates to waiting, not just burst variance.
B: Correct, waiting still occurs behind earlier processes.
C: Incorrect, FCFS is non-preemptive.
D: Incorrect, convoy effect is about burst times and scheduling order.Final Answer:
Option D -> Option DQuick Check:
Equal bursts reduce but do not eliminate waiting [OK]
Quick Trick: Convoy effect is about waiting, not just burst time differences [OK]
Common Mistakes:
MISTAKES- Believing equal bursts eliminate convoy effect
- Thinking FCFS is preemptive
- Confusing convoy effect with priority scheduling
Trap Explanation:
PITFALL- Candidates incorrectly assume convoy effect requires burst time variance, ignoring waiting caused by arrival order.
Interviewer Note:
CONTEXT- Checks subtle understanding of convoy effect beyond burst time differences.
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