Process Scheduling Homework Help
- June 4, 2017
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- Category: Computer Science QA
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1.Suppose that the following processes arrive for execution at the times indicated. Each process will run the listed amount of time. 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 8 P2 0.4 4 P3 1.0 1
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 two 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 and P2 are waiting during this idle time, so their waiting time may increase. This algorithm could be known as future-knowledge scheduling.
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2.Suppose that the following processes arrive for execution at the times indicated. Each process will run the listed amount of time. In answering the questions, use nonpreemptive scheduling and base all decisions on the information you have at the time the decision must be made.
Assume you have the following jobs to execute with one processor, with the jobs arriving in the order listed here:
a. Suppose a system uses FCFS scheduling. Create a Gantt chart illustrating the execution of these processes.
b. what is the turnaround time for process p3?
c. What is the average wait time for the processes?
i pi
0 80
1 20
2 10
3 20
4 50
3.Suppose a system uses priority scheduling (under the following process load), where a small integer means a high priority.
a. Create a Gantt chart illustrating the execution of these processes.
b. What is the turnaround time for process p2 under priority scheduling?
c. What is the average wait time for the processes?
i pi priority
0 80 3
1 20 1
2 10 4
3 20 5
4 50 2
4. Consider design of hash table algorithms because these data structures offer the greatest potential for improvement. How can you be able to efficiently use hash tables in Operating System design which will help CPU scheduling, memory (pagetables), and disk management? Give the complete design and justify size and runtime efficiency. How can you extend the same idea to distributed systems?
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