Operating Systems - FCFS Scheduling - Convoy Effect & Waiting Time
In which scenario is First-Come, First-Served (FCFS) scheduling most appropriate to use?
In which scenario is First-Come, First-Served (FCFS) scheduling most appropriate to use?
easy🔍 Pattern Recognition Q11 of Q15
Step-by-Step Solution
Step 1: Understand FCFS characteristics
FCFS schedules processes in the order they arrive without preemption, making it simple and fair in terms of arrival order.Step 2: Analyze each option
A is incorrect because FCFS does not optimize for similar burst times; it just queues by arrival.
B is incorrect because FCFS can cause long waiting times if a long process arrives first.
C is incorrect because FCFS is non-preemptive and does not handle unpredictable arrivals well.
D is correct because FCFS's main advantage is simplicity and fairness in order, not responsiveness or waiting time optimization.Final Answer:
Option D -> Option DQuick Check:
FCFS is chosen for simplicity and fairness, not for minimizing waiting time or handling preemption.
Quick Trick: FCFS = simple, fair order, not optimized for waiting time
Common Mistakes:
MISTAKES- Assuming FCFS minimizes average waiting time
- Confusing FCFS with preemptive scheduling
- Believing FCFS handles unpredictable arrivals efficiently
Trap Explanation:
PITFALL- Options A and B seem plausible because similar burst times or waiting time minimization are common scheduling goals, but FCFS does not optimize these. Option C is tempting because unpredictable arrivals suggest preemption, but FCFS is non-preemptive.
Interviewer Note:
CONTEXT- Tests candidate's ability to identify appropriate use cases for FCFS scheduling.
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