Operating Systems - Shortest Job First (SJF) - Preemptive vs Non-Preemptive
Which scheduling pattern best fits a system where the CPU always picks the process with the shortest remaining burst time, allowing interruption of running processes?
Which scheduling pattern best fits a system where the CPU always picks the process with the shortest remaining burst time, allowing interruption of running processes?
easy🔍 Pattern Recognition Q1 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify preemption behavior in scheduling
Preemptive SJF allows interruption of running processes when a shorter job arrives, unlike non-preemptive SJF which runs to completion.Final Answer:
Option B -> Option BQuick Check:
Preemptive SJF always picks shortest remaining time and can preempt [OK]
Quick Trick: Preemptive SJF interrupts for shorter jobs [OK]
Common Mistakes:
MISTAKES- Confusing non-preemptive SJF as allowing interruptions
- Thinking Round Robin always picks shortest job
- Assuming FCFS considers burst time
Trap Explanation:
PITFALL- Candidates often confuse SJF variants and think non-preemptive SJF can preempt, which it cannot.
Interviewer Note:
CONTEXT- Tests candidate's understanding of preemption in scheduling patterns.
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