![]() It is a non-preemptive scheduling algorithm. Shortest Job First (SJF): Process which have the shortest burst time are scheduled first.If two processes have the same bust time then FCFS is used to break the tie. Note:First come first serve suffers from convoy effect. FCFS is a non-preemptive scheduling algorithm. The running process is then removed from the queue. When the CPU is free, it is allocated to the process at the head of the queue. When a process enters the ready queue, its PCB is linked onto the tail of the queue. It is implemented by using the FIFO queue. First come first serve scheduling algorithm states that the process that requests the CPU first is allocated the CPU first. Min response time įirst Come First Serve (FCFS): Simplest scheduling algorithm that schedules according to arrival times of processes. Objectives of Process Scheduling Algorithm This is possible only with process scheduling. In multi programming systems, one process can use CPU while another is waiting for I/O. In a uni programming system like MS-DOS, time spent waiting for I/O is wasted and CPU is free during this time. Waiting Time = Turn Around Time – Burst TimeĪ typical process involves both I/O time and CPU time. Waiting Time(W.T): Time Difference between turn around time and burst time. ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys. ![]()
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