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- If priorities range from 63 (low) to 0 (high), we could increase the priority of a waiting process by 1 every 15 minutes. Eventually, even a process with an initial priority of 63 would have the highest priority in the system and would be executed. In fact, it would take no more than hours for a priority-63 process to age to a priority-0 process.a single process, with execution time of BT time units, is detected by the system that uses Round Robin algorithm with time quantum of QT time units. Every time the time quantum elapses; a contect switch is always performed with CS time units. Assume that the process come at time equal to zero(0) If BT is 25, QT is 10 and CS is 2, what is the Cpu utilization of the system? If BT is 20, QT is 6 and CS is 1 what is the CPU utilization of the system? What is the CPU utilization if BT is equal QT and QT is equal to CS? What is the system's throughput if BT is less than QT? What is the system's turnaround time (TAT) if BT is less than QT?Real-time scheduling: In a system consisting of two processes, P1 and P2, suppose process P1 has a period p1 of 50, an execution time t1 of 25, and a deadline that matches its period (50). Further, suppose that P2 has a period p2 of 75, an execution time t2 of 30, and a deadline that matches its period (75). Is this real-time system schedulable under rate-monotonic scheduling? Explain your answer using the concept of overall CPU utilization and schedulability.
- For the following processes, estimate average waiting time for priotiry scheduling combines with round robin scenario.Consiider quanta of 1s. Process Burst TimePriority P1 10 3 P2 1 P3 2 2 P4 1 Ps 2 P6 3Consider four processes with the following start and end times: Process Start Time End Time ABCD 3 5 1 7 6 12 4 9 For each pair of proceses, say whether they run concurrently (Y) or not (N). (a) AB (b) AC (c) AD (d) BC (e) BD (f) CDAn operating system uses Shortest Remaining Time first (SRTF) process scheduling algorithm. Consider the arrival time and burst times for the following processes Process Burst Time Arrival Time P₁ 10 0 P₂ 8 4 P3 15 2 P4 4 6 What is the waiting time of the process P3(answer up to 1 decimal place)?
- Assuming a Round-Robin Scheduling works with a quantum time of 5, draw the timeline for CPU- and I/Obursts for the following three processes; A, B, C, with their arrival times, execution and I/O times. k=5 m=10 p=3Four processes arrive at the same time with their priorities, execution times and I/0 times given in the table below. Assuming a Round-Robin Scheduling works with a quantum time of 3, but the scheduler selects the with highest priority from the queue (NOT those arrived earliest), other than currently pre-empted process, at each turn3; process a-)Draw the timeline for CPU- and I/O- bursts for these processes b-)Calculate average turn-around time Exec 1/0 Exec /0 Process Priority 2. P1 10 4 P2 7. 4. 4 P3 1 10 1 4 Pa7. Consider the following table: P1 P2 P3 P4 P5 P6 Process 17 4 8 1 12 5 Burst Time 5 2 3 1 3 4 Priority a). Draw four Gantt charts that illustrate the execution of these processes using the following scheduling algorithms: FCFS SJF Non Preemptive Priority and Round-Robin (quantum-4). Which algorithm gives less average waiting time?
- Consider the following set of processes, with the length of the CPU burst given in milliseconds: Process Burst Time Priority P1 3 P2 8 1 P3 P4 4 P5 4 3 The processes are assumed to have arriv all at time 0. a. Draw four Gantt charts that illustra the following scheduling algorithms:FCF (a larger priority number implies a hig b. What is the turnaround time of each in part a? c. What is the waiting time of each pro d. Which of the algorithms results in t 2.Consider five processes p1, p2, p3, p4 and p5 that are wants to perform operationarriving at time 0 and 2. Maximum time requirement of these process are 20, 40,10,30,5 unit respectively. Processes spend 10% on I/O operation, 70% on CPUexecution and last 20 % on I/O again. The CPU use SJF (preemptive version)algorithm, schedule a new process either when the running process gets blocked onI/O or when the running process finished its compute burst. Assume that all I/Ooperations can be overlapped as much as possible. Show complete workingA variation of the round-robin scheduler is the regressive round-robin scheduler. This scheduler assigns each process a time quantum and a priority. The initial value of a time quantum is 50 milliseconds.However, every time a process has been allocated the CPU and uses its entire time quantum (does not block for I/O), 10 milliseconds is added to its time quantum, and its priority level is boosted. (The time quantum for a process can be increased to a maximum of 100 milliseconds.) When a process blocks before using its entire time quantum, its time quantum is reduced by 5 milliseconds, but its priority remains the same. What type of process (CPU-bound or I/O-bound) does the regressive round-robin scheduler favor?