PREEMPTIVE SHORTEST JOB FIRST SCHEDULING ALGORITHM OS
Preemptive Shortest Job First (PSJF) scheduling algorithm is a type of CPU scheduling algorithm used by operating systems to determine the order in which processes are executed on a CPU.
In PSJF scheduling algorithm, the CPU executes the process with the shortest execution time first. The algorithm is preemptive, which means that if a new process with a shorter execution time arrives, it will preempt the currently executing process and take its place.
The PSJF algorithm reduces the average waiting time for processes compared to the FCFS and SJF algorithms. However, it requires the operating system to have information about the length of each process's execution time, which may not always be available.
One of the main advantages of the PSJF scheduling algorithm is that it minimizes the average waiting time and turnaround time of processes, which results in better system performance. However, the algorithm can also cause problems such as starvation, where long-running processes may never get a chance to execute if shorter processes continue to arrive.
Overall, the PSJF scheduling algorithm is a useful tool for improving the performance of operating systems, particularly in scenarios where the arrival rate and execution times of processes are known
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