What type of process (CPU-bound or I/O-bound) does the regressive round-robin scheduler favor?
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A 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? Explain.
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- Three processes of an operating system has P(arrival time, burst time) as follows: P1(0,6),P2(2,5), P3(4,2). Work out the average waiting time in this system when processes are scheduled with Shortest-Remaining-Time-First scheduling algorithm. a)1.3 b)3 c)4 d) 2.5 Note : please with explain Oprating systemWhen a process p requests a resource using the request resource function, its state is set to ______________ if the requested resource is unavailable. Ready Blocked Ready Suspended The PCB contains an out-of-date copy of the CPU state of process Q when Q is running. True False The main benefit of using virtual CPUs is that they increase processing speed. True FalseComputer Science In theory, it is possible to have some CPU cores execute one scheduling algorithm (e.g. round-robin) on one set of processes, and some other CPU cores execute another scheduling algorithm (e.g. FCFS) on another set of processes. High-level code for such a scheduler might look like: What do you see as the advantages and disadvantages of using this scheme instead of a single scheduling algorithm?
- Given below are the arrival and burst times of four processes P1, P2, P3 and P4. Using SJF preemptive and RR scheduling (Quantum = 5ms, no priority based preemption). PROCESS NO Arrival time (msec) Burst time(msec) P1 2 7 P2 3 3 P3 4 5 P4 6 6 Write a program to calculate the average waiting time, average turnaround time, average response time, throughput, and CPU utilization. For what percentage of does the CPU remain idle?Given below are the arrival and burst times of four processes P1, P2, P3 and P4. Using SJF preemptive and RR scheduling (Quantum = 5ms, no priority based preemption). PROCESS NO Arrival time (msec) Burst time(msec) P1 2 7 P2 3 3 P3 4 5 P4 6 6 Write a program to calculate the average waiting time, average turnaround time, average response time, throughput, and CPU utilization. For what percentage of does the CPU remain idle? C Language code3. An external event is sensed using polling with period P. It takes 100 cycles to processthe event. Processor frequency is 48 MHz. Before starting a new period, the previouspolling task should have finished. The relative deadline for processing an event is 10μs.(a) Determine the range of feasible polling periods? (b) Suppose now that an unrelated interrupt may occur and the interrupt has higher priority than the code for processing the polling event. Including all overhead, it takes 40 cycles to process the interrupt. The minimum time between two subsequent interrupts is T. Suppose that T is larger than 140 cycles. Determine the range of feasible polling periods.
- A single-CPU system has four processes, P1, P2, P3 and P4 in the ready queue. The execution times and I/O needs for these processes are given below. All times are in ms. (hint: when a process starts an IO operation, it is removed from the ready queue and put back at the end of the queue only when it completes its IO). Process P1: Arrives at 0ms, needs 23ms of CPU time. Performs I/O for 5ms after 10ms of its execution time, then another 5ms after 20ms of its execution time. Process P2: Arrives at 3ms, needs 12ms of CPU time. Performs I/O for 10ms after 5ms of its execution time. Process P3: Arrives at 1ms, needs 15ms of CPU time. Performs I/O for 1ms after 7ms of its execution time. Process P4: Arrives at 2ms, needs 8ms of CPU time. Performs I/O for 5ms after 4ms of its execution time. We assume that the CPU is idle if no one of these four processes is using it. Using Round Robin scheduling algorithm with a Time Quantum of 4ms and ignoring the context switch time, determine: a) The…Three periodic processes of an operating system has P(burst time, period) as follows: P1(4,20), P2(6,10), P3(12,30). Which of the following is true when these processes are scheduled with Rate-Monotonic scheduling algorithm that assigns priorities proportional to periods (shorter period has higher priority). a)No process misses a deadline b)Only P3 misses its deadline c)P1, P2 and P3 all miss their deadlines d)P2 and P3 both miss their deadlinesOn single-processor systems, in a correct solution to the criticalsection problem: a) A process that does not execute a code-related to the Critical Sectionshould not prevent others from entering the Critical Sectionb) Processes should enter the Critical Section in First-Come-First-Servedfashionc) Some slow processes may starved) Interrupts have to be disabled when one process is in the Critical Section
- ProcessBurst Time Priority Arrival TimeP1 10 3 0P2 1 1 0P3 2 5 0P4 1 4 0P5 5 2 0For the set of processes directly above, draw a Gantt chart for the FCFS Scheduling Algorithm.Three processes and their service times are P1 = 200, P2 = 125, P3 = 70 are to be scheduled to run using the Round Robin Scheduling algorithm with a time slice of 50. Calculate the Turn Around Time for P2 (Assume they get scheduled to run in the order P1, p2, p3). a. 395 b. 345 c. 250 d. 270 e. 125Draw the Gantt chart, Calculate the Average Turnaround Time AND Average Waiting Time for the following processes using FCFS Scheduling. Processes Arrival Time CPU Burst Time P1 0 6 P2 1 4 P3 2 3 P4 3 2