5- Three processes P1, P2 and P3 have Process(arrival time, execution time) as follows. P1(0,7), P2(2,4), P3(3,1). Find the average waiting time for these processes if they are scheduled as Shortest Remaining Time First.
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- Q)Two processes P1, and P2 arrive at time=0 in order and have Process(execution time) as follows. P1(4), P2(2). Find the average waiting time for these processes if they are scheduled as Round Robin with time quanta of 1 unit. a)2 b)1 c)3 d)4 Q)Three processes P1, P2 and P3 arrive at time=0 in order and have Process(execution time) as follows. P1(10), P2(4), P3(7). Find the average response time for these processes if they are scheduled as Shortest Job First. a)12 b)3.3 c)5 d)4 Q)A process has executed 3 ms in its last burst and our estimate of its last burst was 6 ms. Find our estimate for its next burst with a)4 ms b)4.5 ms c)3.5 ms d)5 msQ)Two processes P1, and P2 arrive at time=0 in order and have Process(execution time) as follows. P1(4), P2(2). Find the average waiting time for these processes if they are scheduled as Round Robin with time quanta of 1 unit. a)2 b)1 c)3 d)4Let 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,…
- 1. Two processes, A and B, each need three resources, 1, 2, and 3. Suppose 4 requests them in the order 1, 2, 3. If B also requests them in the same order, deadlock is not possible. However, if B requests them in the order 3, 2, 1, then deadlock is possible. With three resources, there are 3! or six possible orders in which B can request them. For each possible order in which B can request these resources, state whether or not a deadlock is possible for that order. (Assume that once a process acquires a resource, it does not release that resource until the end of that process.) a) 1, 2, 3 b) 1,3,2 c) 2, 1, 3 d) 2, 3, 1 e) 3, 1, 2 f) 3, 2, 1Let the processes P1, P2, P3, and P4 be given. They arrive in the system at the same time in this order. The processes have the following service times (in time units): Process P1 P2 P3 P4 Service time (CPU burst) 53 17 68 24 For the scheduling method "Round Robin" (RR), specify the average execution time (average turnaround time) and the number of context switches. The time quantum q is set to 20 time units. You must show your calculations. You will not have to draw Gantt charts. Note: For RR, processes execute in order of their ID (i.e., P1-P2-P3-P4).Let the processes P1, P2, P3, and P4 be given. They arrive in the system at the same time in this order. The processes have the following service times (in time units): P2 17 Process Service time (CPU burst) P1 53 P3 68 P4 24 For the scheduling method "Shortest Job First" (SJF), specify the execution order of the processes, the average execution time (average turnaround time) and the average waiting time over all processes. You must show your calculations. You will not have to draw Gantt charts.
- A deadlock occurs when a group of processes is stalled because one process is holding a resource and waiting for another process to obtain it. Consider the situation when two trains are approaching each other on the same track and there is only one track: once they are in front of each other, neither train can proceed. In operating systems, a similar scenario happens when two or more processes possess certain resources while waiting on resources owned by other processes (s). In the picture below, Process 1 is holding Resource 1 and waiting for Process 2 to acquire Resource 2, while Process 2 is waiting for Resource 1. Give an example of a realistic deadlock avoidance approach and describe the basic strategy behind it.Given that there are FIVE (5) processes (A, B, C, D and E) and FOUR (4) resources (R1, R2,R3 and R4) involved in a project. Assume that all the resources are non-sharable and the number of instances for each resource is 2, 3, 2, 3 respectively. *Process A holds one instance of R1, R2 and R4. It requests one instance of R3.* Process B holds one instance of R1 and R3. It requests one instance of R4.* Process C holds one instance of R2 and R4.* Process D holds one instance of R2 and R4. It requests one instance of R1.* Process E holds one instance of R3. It requests one instance of R2. (i) Draw a directed resources allocation graph for the above scenario and Are these five processes in a deadlock state? Justify your answer.Which one of the following statements about waiting times of processes is FALSE? The average waiting time for a given set of processes with Shortest-Job-First scheduling (without preemption) depends on the order in which the processes arrived in the queue. None of the mentioned Multi-level Queue Scheduling is most suitable when processes have diverse needs in terms of CPU and I/O bursts The average waiting time for a given set of processes with Priority scheduling (without preemption) does not depend on the order in which the processes arrived in the queue. The average waiting time for a given set of processes with First-Come-First-Served scheduling (without preemption) depends on the order in which the processes arrived in the queue.
- Suppose that the following processes arrive for execution at the time given below. Each process will run for the amount of time listed. Calculate average turnaround and average waiting time for these processes under Shortest remaining time first (SRTF)(preemptive) scheduling AlgorithmHints: turnaround time: The interval from the time of arrival of a process to the time of completionWaiting time: The sum of the periods spent waiting by a process in the ready queueSuppose there are five processes, their arrival time and running time are listed as follows. Adopt FCFS and SJF, respectively, give the schedule order and average waiting time. Give the schedule order of SJF. Compute the average waiting time of SJF. Process Arrival time Running time P1 P2 P3 P4 0 3 4 5 3 10 6 1(i) Describe Banker’s algorithm for deadlock avoidance with supporting example Consider a computer system with has four identical units of a resource R. There are three processes each with a maximum claim of two units of resource R. Processes can request these resources in anyway, that is, two in one shot or one by one. The system always satisfies a request a request for a resource if enough resources are available. If the process doesn’t request any other kind of resource, show that the system never deadlock Give a solution for the following synchronization problem using semaphores Producer- Consumer Problem Readers- Writers Problem List out the issues in preprocessor scheduling that causes performance degradation in multiprocessor systems