Consider the following set of processes, with the length of the CPU burst given in milliseconds. In the last column, O denotes the highest priority whereas 2 denotes the lowest priority level. Process Arrival Time (ms) Burst Time (ms) Priority P1 0 10 2 P2 3 1 P3 2 0 P4 5 3 0 PS 6 5 1 Draw three Gantt charts that illustrate the execution of these processes using FCFS, preemptive Shortest Job First (SJF), and priority scheduling with round robin (quantum = 2) scheduling algorithms. The preemptive SJF does not use the priority to make its decision. ***To avoid confusion here: If a process of highest priority is currently scheduled, and another process of the highest priority class arrives, newly arriving process MUST WAIT UNTIL THE END OF THE QUANTUM OF THE ACTIVE PROCESS. If a process of a lower priority class is currently scheduled, and a process of higher priority class has arrived, the newly arriving process CAN PREEMPT THE ACTIVE PROCESS WITHOUT WAITING UNTIL THE END OF THE QUANTUM.**** 3 4
Consider the following set of processes, with the length of the CPU burst given in milliseconds. In the last column, O denotes the highest priority whereas 2 denotes the lowest priority level. Process Arrival Time (ms) Burst Time (ms) Priority P1 0 10 2 P2 3 1 P3 2 0 P4 5 3 0 PS 6 5 1 Draw three Gantt charts that illustrate the execution of these processes using FCFS, preemptive Shortest Job First (SJF), and priority scheduling with round robin (quantum = 2) scheduling algorithms. The preemptive SJF does not use the priority to make its decision. ***To avoid confusion here: If a process of highest priority is currently scheduled, and another process of the highest priority class arrives, newly arriving process MUST WAIT UNTIL THE END OF THE QUANTUM OF THE ACTIVE PROCESS. If a process of a lower priority class is currently scheduled, and a process of higher priority class has arrived, the newly arriving process CAN PREEMPT THE ACTIVE PROCESS WITHOUT WAITING UNTIL THE END OF THE QUANTUM.**** 3 4
Chapter11: Operating Systems
Section: Chapter Questions
Problem 20VE
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