![]() Let us take an example of SJF scheduling, with the given set of processes below, and the length of the CPU burst in milliseconds: If the subsequent CPU bursts of two processes become the same, then FCFS scheduling is used to break the tie. ![]() If the CPU is available, it is assigned to the process that has the minimum next CPU burst. When the processes arrive in the order - P1, P2, P3 and is served using FCFS method, you get the outcome as given in the below mentioned Gantt chart:Ī diverse approach to CPU scheduling is the technique of shortest-job-first (SJF) scheduling algorithm which links with each process the length of the process's next CPU burst. ![]() When the CPU gets free, it is assigned to the process at the head or start of the queue.Ĭonsider the following set of processes/jobs which arrive at time 0, with the length of the CPU burst that is given in milliseconds: As a process enters the ready queue, its Process Control Block is linked with the tail of the queue. The execution of the FCFS policy is easily managed with a FIFO queue. ![]() With this method, the process which requests the CPU first, that process gets allocated to the CPU first. First-Come, First-Served Scheduling (FCFS) Algorithmīy far the easiest and simplest CPU scheduling algorithm is the first-come, first served (FCFS) scheduling technique.
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