![]() ![]() Shortest Job First (SJF) is a CPU Scheduling algorithm in which allocation of CPU is based on burst time. Algorithm:ġ- Sort all the processes in increasing order according to burst time.Shortest Job First (SJF) Scheduling algorithm Program in C | non-preemptive We scheduled the same set of processes using the First come first serve algorithm, and got average waiting time to be 18.75 ms, whereas with SJF, the average waiting time comes out 4.5 ms. (either Arrival time is 0 for all, or Arrival time is same for all)Īs you can see in the GANTT chart above, the process P4 will be picked up first as it has the shortest burst time, then P2, followed by P3 and at last P1. This scheduling algorithm is optimal if all the jobs/processes are available at the same time.To successfully implement it, the burst time/duration time of the processes should be known to the processor in advance, which is practically not feasible all the time.This is the best approach to minimize waiting time.Shortest Job First scheduling works on the process with the shortest burst time or duration first. SJF can be used in specialized environments where accurate estimates of running time are available. While it is not possible to predict execution time, several methods can be used to estimate the execution time for a job, such as a weighted average of previous execution times. ![]()
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