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In which scenario is Round Robin scheduling with a fixed time quantum most appropriate compared to First-Come-First-Serve or Priority scheduling?

easy🔍 Pattern Recognition Q11 of Q15
Operating Systems - Round Robin Scheduling - Quantum & Turnaround Time
In which scenario is Round Robin scheduling with a fixed time quantum most appropriate compared to First-Come-First-Serve or Priority scheduling?
AWhen processes have highly variable CPU burst times and fairness among all processes is required
BWhen all processes have identical priorities and long CPU bursts
CWhen minimizing average turnaround time is the only goal
DWhen processes have strict deadlines and real-time constraints
Step-by-Step Solution

  1. Step 1: Understand Round Robin's fairness goal

    Round Robin scheduling is designed to allocate CPU time slices fairly among all processes, especially when burst times vary widely.

  2. Step 2: Analyze other options

    When all processes have identical priorities and long CPU bursts is less suitable because identical priorities and long bursts favor FCFS or SJF for efficiency, not fairness. When minimizing average turnaround time is the only goal ignores fairness and focuses only on turnaround time, which RR does not optimize. When processes have strict deadlines and real-time constraints requires real-time guarantees, which RR cannot provide due to its time slicing.

  3. Final Answer:

    Option A -> Option A

  4. Quick Check:

    RR is best when fairness and responsiveness matter, especially with variable burst times.
Quick Trick: RR = fairness with variable bursts
Common Mistakes:
MISTAKES
  • Assuming RR always minimizes turnaround time
  • Believing RR suits real-time deadlines
  • Confusing RR with priority-based scheduling
Trap Explanation:
PITFALL
  • Options B and C seem plausible because RR does handle identical priorities and turnaround time, but RR sacrifices turnaround time optimization for fairness. Option D is tempting but RR is not real-time safe.
Interviewer Note:
CONTEXT
  • Tests candidate's ability to identify when Round Robin is the appropriate scheduling algorithm.
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