Given processes arriving at different times with burst times 4, 3, and 2 units, how does non-preemptive SJF schedule them if the second process arrives after the first starts?

medium🧠🧾 Concept Trace Q4 of Q15

Operating Systems - Shortest Job First (SJF) - Preemptive vs Non-Preemptive

AThe first process runs to completion before the second starts

BThe second process preempts the first immediately upon arrival

CThe CPU remains idle until the shortest job arrives

DProcesses are scheduled in order of arrival regardless of burst time

Step-by-Step Solution

Solution:

Step 1: Understand non-preemptive scheduling behavior
Once a process starts, it runs to completion without interruption.
Step 2: Apply to scenario with staggered arrivals
First process runs fully; second process waits even if shorter.
Final Answer:
Option A -> Option A
Quick Check:
Non-preemptive SJF does not allow preemption after start [OK]

Quick Trick: Non-preemptive means no interruption after start [OK]

Common Mistakes:

MISTAKES

Thinking second process preempts first
Assuming CPU idles unnecessarily
Believing scheduling ignores burst time

Trap Explanation:

PITFALL

Candidates confuse preemptive and non-preemptive rules, expecting preemption where none occurs.

Interviewer Note:

CONTEXT

Checks grasp of non-preemptive scheduling with staggered arrivals.

Master "Shortest Job First (SJF) - Preemptive vs Non-Preemptive" in Operating Systems

2 interactive learning modes - each teaches the same concept differently

Solution Trace

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

More Operating Systems Quizzes

Given processes arriving at different times with burst times 4, 3, and 2 units, how does non-preemptive SJF schedule them if the second process arrives after the first starts?

Step 1: Understand non-preemptive scheduling behavior

Step 2: Apply to scenario with staggered arrivals

Final Answer:

Quick Check:

Want More Practice?