A starvation free job scheduling policy guarantees that no job indefinitely waits for a service. Which of the following job scheduling policies is starvation free?a)Priority queingb)Shortest Job Firstc)Youngest Job Firstd)Round robinCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Round Robin is a starvation free scheduling algorithm as it imposes a strict time bound on the response time of each process i.e. for a system with 'n' processes running in a round robin system with time quanta tq, no process will wait for more than (n-1) t_q time units to get its CPU turn. Option (D) is correct.

Answer

Introduction:
A starvation-free job scheduling policy ensures that no job in a system is indefinitely waiting for service. This means that every job will eventually receive the required service without any starvation. Among the given options, the round-robin scheduling policy is the only one that guarantees starvation-free job scheduling.

Explanation:
1. Priority queuing:
- In priority queuing, jobs are assigned priorities, and the highest priority job is selected for execution.
- While this policy ensures that higher priority jobs are executed first, it does not guarantee starvation-freedom.
- If there are a large number of high priority jobs, lower priority jobs may face starvation as they wait indefinitely for service.

2. Shortest Job First (SJF):
- SJF selects the job with the smallest execution time for execution.
- While SJF can minimize the average waiting time, it does not guarantee starvation-freedom.
- If there are long-running jobs in the system, shorter jobs may face starvation as they wait indefinitely for service.

3. Youngest Job First (YJF):
- YJF selects the job that arrived most recently for execution.
- Similar to SJF, YJF does not guarantee starvation-freedom.
- If there are jobs continuously arriving with higher priorities, older jobs may face starvation.

4. Round Robin (RR):
- Round-robin scheduling allocates an equal time slice to each job in a cyclic manner.
- This policy ensures that each job gets a fair share of the processor's time.
- If a job's time slice expires, it is moved to the back of the queue and other jobs get an opportunity to execute.
- Round robin scheduling guarantees that no job waits indefinitely for service, making it a starvation-free policy.

Conclusion:
Among the given options, the round-robin scheduling policy is the only one that guarantees starvation-free job scheduling. Priority queuing, shortest job first, and youngest job first policies do not provide such a guarantee and may result in job starvation.

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