Let the processes P1, P2, P3, P4, and P5 be given. They arrive in the system at the same time in this order. The processes have the attached service times (in time units) and priorities. For each of the scheduling methods (First Come, first served (FIFO), Shortest Job First, Round Robin, and Priority Scheduling), specify the execution order of the processes and the average execution time (average turnaround time) for all processes. First, determine and state the execution times of the individual processes and then calculate the average value. Note: • For Shortest Job First, If the required service time (CPU time) is the same for two or more processes, use First Come, first served to resolve the conflict. • For Round Robin, the time quantum q = one time unit. • For Priority Scheduling, low integer priority values signify high priorities, with 0 being the highest possible priority. If multiple processes have the same priority, use First Come, first served to resolve the conflict. Also, remember that RR is pre-emptive. • You do not have to draw Gantt charts.
Let the processes P1, P2, P3, P4, and P5 be given. They arrive in the system at the same time in this order. The processes have the attached service times (in time units) and priorities. For each of the scheduling methods (First Come, first served (FIFO), Shortest Job First, Round Robin, and Priority Scheduling), specify the execution order of the processes and the average execution time (average turnaround time) for all processes. First, determine and state the execution times of the individual processes and then calculate the average value. Note: • For Shortest Job First, If the required service time (CPU time) is the same for two or more processes, use First Come, first served to resolve the conflict. • For Round Robin, the time quantum q = one time unit. • For Priority Scheduling, low integer priority values signify high priorities, with 0 being the highest possible priority. If multiple processes have the same priority, use First Come, first served to resolve the conflict. Also, remember that RR is pre-emptive. • You do not have to draw Gantt charts.
Chapter11: Operating Systems
Section: Chapter Questions
Problem 23VE
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Let the processes P1, P2, P3, P4, and P5 be given. They arrive in the system at the same time in this order. The processes have the attached service times (in time units) and priorities.
For each of the scheduling methods (First Come, first served (FIFO), Shortest Job First, Round Robin, and Priority Scheduling), specify the execution order of the processes and the average execution time (average turnaround time) for all processes. First, determine and state the execution times of the individual processes and then calculate the average value.
Note:
• For Shortest Job First, If the required service time (CPU time) is the same for two or more processes, use First Come, first served to resolve the conflict.
• For Round Robin, the time quantum q = one time unit.
• For Priority Scheduling, low integer priority values signify high priorities, with 0 being the
highest possible priority. If multiple processes have the same priority, use First Come, first
served to resolve the conflict. Also, remember that RR is pre-emptive.
• You do not have to draw Gantt charts.
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