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a) What is the average turnaround time for these processes with the FCFS scheduling algorithm? b) What is the average turnaround time for these processes with the SJF scheduling algorithm? c) The SJF algorithm is supposed to improve performance, but notice that we chose to run process P1 at time 0 because we did not know that three shorter processes would arrive soon. Compute what the average turnaround time will be if the CPU is left idle for the first 1 unit and then SJF scheduling is used. Remember that processes P1, P2, P3 are waiting during this idle time, so their waiting time may increase.

a) What is the average turnaround time for these processes with the FCFS scheduling algorithm? b) What is the average turnaround time for these processes with the SJF scheduling algorithm? c) The SJF algorithm is supposed to improve performance, but notice that we chose to run process P1 at time 0 because we did not know that three shorter processes would arrive soon. Compute what the average turnaround time will be if the CPU is left idle for the first 1 unit and then SJF scheduling is used. Remember that processes P1, P2, P3 are waiting during this idle time, so their waiting time may increase.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Suppose that the following processes arrive for execution at the times indicated. Each process will run for the amount of time listed. In answering the questions, use non-preemptive scheduling, and base all decisions on the information you have at the time the decision must be made. Process Arrival Time Burst Time P1 0.0 P2 0.4 P3 0.6 4 P4 1.0 a) What is the average turnaround time for these processes with the FCFSS scheduling algorithm? b) What is the average turnaround time for these processes with the SJF scheduling algorithm? c) The SJF algorithm is supposed to improve performance, but notice that we chose to run process P1 at time 0 because we did not know that three shorter processes would arrive soon. Compute what the average turnaround time will be if the CPU is left idle for the first 1 unit and then SJF scheduling is used. Remember that processes P1, P2, P3 are waiting during this idle time, so their waiting time may increase.
Transcribed Image Text:Suppose that the following processes arrive for execution at the times indicated. Each process will run for the amount of time listed. In answering the questions, use non-preemptive scheduling, and base all decisions on the information you have at the time the decision must be made. Process Arrival Time Burst Time P1 0.0 P2 0.4 P3 0.6 4 P4 1.0 a) What is the average turnaround time for these processes with the FCFSS scheduling algorithm? b) What is the average turnaround time for these processes with the SJF scheduling algorithm? c) The SJF algorithm is supposed to improve performance, but notice that we chose to run process P1 at time 0 because we did not know that three shorter processes would arrive soon. Compute what the average turnaround time will be if the CPU is left idle for the first 1 unit and then SJF scheduling is used. Remember that processes P1, P2, P3 are waiting during this idle time, so their waiting time may increase.
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