Shortest Job First (SJF) – Non Preemptive. Shortest Job First (SJF) is a Scheduling Algorithm where the process are executed in ascending order of their burst time, that is, the process having the shortest burst time is executed first and so on. The processor knows burst time of each process in advance.
Shortest job first (SJF) or shortest job next, is a scheduling policy that selects the waiting process with the smallest execution time to execute next. SJN is a non-preemptive algorithm.
Shortest Job First (SJF) is a type of disk scheduling algorithm in the operating system in which the processor executes the job first that has the smallest execution time. In the shortest Job First algorithm, the processes are scheduled according to the burst time of these processes.
There are two main types of CPU scheduling, preemptive and non-preemptive. Preemptive scheduling is when a process transitions from a running state to a ready state or from a waiting state to a ready state. Non-preemptive scheduling is employed when a process terminates or transitions from running to waiting state.
The main benefit of using the SJF algorithm is that it maximizes the system throughput, which is the number of tasks that can be completed in a given time interval. By choosing the shortest tasks first, the SJF algorithm reduces the idle time of the processor and increases the utilization rate.
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