SJF preemtive algorithm | shortest job first sheduling algorithm in OS |
In this SJF Preemptive Scheduling, jobs are always ready to appear in the queue. A process executes first when it has the shortest burst time. If a process with a much shorter burst time appears at first, the current process receives its removal or preemption from the execution phase.
Shortest Job First (SJF) algorithm is also known as Shortest Job Next (SJN) or Shortest Process Next (SPN). It is a CPU processes scheduling algorithm that sorts and executes the process with the smallest execution time first and then the subsequent processes with the increased execution time.
Waiting Time = Total Waiting Time / No. of Process = 41 / 5 = 8.2 mills. Total Turnaround Time : P1 = 28 + P2 = 7 + P3 = 12 + P4 = 19 + P5 = 3 = 69 mills.
Preemptive shortest job first
Preemptive means that if another process arrives with an even shorter burst time after the process with the shortest burst time and arrival time is given CPU time, the CPU cycle is allocated to the process with the shorter burst time.
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