In a computer system five processes are attempting to proceed with three resource types. The total units of system resources are: (8,9,7). The maximum demands for every process are: P1(3,1,1), P2(3,3,2), P3(5,3,2), P4(5,1,2), P5(8,4,3). The current allocation is: P1 (0,1,1), P2 (2,1,1), P3 (3,1,2), P4 (1,1,1), and P5 (2,3,2). Is this state a safe state? Explain your answer. Please explain in great detail so i can understand .
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In a computer system five processes are attempting to proceed with three resource types.
The total units of system resources are: (8,9,7).
The maximum demands for every process are: P1(3,1,1), P2(3,3,2), P3(5,3,2), P4(5,1,2), P5(8,4,3). The current allocation is: P1 (0,1,1), P2 (2,1,1), P3 (3,1,2), P4 (1,1,1), and P5 (2,3,2). Is this state a safe state?
Explain your answer. Please explain in great detail so i can understand .
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- Multiprocessor systems use multiple CPUS to perform various tasks. This increases throughput and reduces response time. In this problem, a multiprocessor system has a certain number of processors. Each processor has the ability to schedule a limited number of processes in one second. However, after this scheduling, the processor's ability is reduced to floor(ability/2). Given the processor's abilities and the number of processes, what is the minimum time required to schedule all the processes in the system? Example n = 5 (number of processors and size of ability[]) ability = [3, 1, 7, 2, 4] processes = 15 This optimal solution is: 1. First, the processor with ability = 7 schedules 7 processes in one second. Now, ability = [3, 1, 3, 2, 4] because 7 was reduced to floor(7/2). There are 15 - 7 = 8 remaining processes. 2. Second, the processor with ability = 4 is used. After that, ability = [3, 1, 3, 2, 2]. Remaining processes = 8 - 4 = 4. 3. Third, a processor with ability = 3 is used.…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…Consider a system with six processes P1, P2, P3, P4, P5, and P6, and five resources R1, R2, R3, R4, and R5. Each process can request and hold multiple instances of a resource, and each resource can be held by only one process at a time. The following table shows the maximum resource needs and current resource allocation of each process: Process Max Needs Allocation P1 R1:2 R1:1 P2 P3 P4 P5 P6 R2:1 R1:1 R4:2 R3:3 R5:1 R2:1 R4:1 R4:1 R3:2 R5:1 Draw a Resource Allocation Graph (RAG) to represent the current state of the system. Use the RAG to determine whether there are any deadlock cycles present in the system. If there are, identify the processes and resources involved in each deadlock cycle. How many deadlock cycles are present in the system? If there are any deadlock cycles, identify the processes and resources involved in each cycle.
- 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): Process Service time (CPU burst) 1. P1 53 P2 17 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.An operating system has 3 user processes running in a set, each requiring 2 units of resource R. The minimum number of units of R such that no deadlocks will ever arise is:Consider the following set of processes, each of which needs a certain amount of a series of shared resources (denoted as resources A, B, and C) to complete its work. The following chart shows the state of the system at a given point in time: Process Allocation Request Available A B C A B C A B C P0 1 1 1 1 0 0 0 0 0 P1 2 0 1 0 0 0 P2 0 1 0 0 0 2 P3 4 0 1 0 3 0 P4 0 2 0 4 0 2 Suppose that a process will hold all resources it has until it obtains all the resources it needs. Once it obtains all the resources it needs, it will complete its work and release all of the resources back into the available pool. Is there an order of execution for these processes that will lead to them all finishing their work, or will the system end up in a deadlocked state? If the system will end up in a deadlocked state, please explain why this deadlock will occur. You do not have to show any work for this question, just provide an…
- 4 Processes (P1,P2,P3,P4) arrived at time 0. The Duration of the processes are (6,8,4,2). All processes have a common X% wait time.The first process finishes at around 10.00. What is the common wait percentage for the processes (X). IVO Wait Time 80% 30% 60% Processes CPU Utilization 1 0.2 0.70 0.4 2 0.35 0.90 0.55 0.5 0.95 0.70 4 0.7 0.98 0.80 Select one: O a. Less than 30% O b. 30% O c. 60% v O d. More than 80% O e. 80% O f. None of the mentionedThere are six processes in three priority classes. Class 1 has the highest priority. (The amount of CPU time needed by each process is written in brackets.) • Class 1: II₁ (13 ms), II3 (8 ms), II6 (6 ms) • Class 2: II₂ (10 ms), II5 (4 ms) Class 3: II4 (12 ms) The system is using the following algorithm: The scheduler picks a process from the highest (non-empty) class. To schedule processes within the same class, the Round-Robin algorithm is used with quantum 5 ms. Process switch takes 1 ms. (a) Draw the schedule for the above processes on a timeline. (b) Mirko decided to modify the above algorithm: After each burst (i.e. when the quantum experies) the process is degraded by one class (unless it is already in Class 3). Draw the schedule for Mirko's modified algorithm.An operating system has a total of three user processes, and each of these processes uses a total of two units of the resource R. The total number of units that R is used up by the operating system is twelve. The absolute minimal number of R units that must be used to eliminate the possibility of any deadlocks happening is
- There are 3 resources R1, R2 and R3 with one instance each and three processes P1, P2 and P3 in an operating system. A snapshot of the system resource allocation graph shows the following: R1 is allocated to P2; R2 is allocated to P1; R3 is allocated to P3; P1 requests R1; P2 requests R3; P3 requests R2. Which of the following is true about this system? answer ) a)Undetermined b)There is deadlock in the system c)Deadlock will never happen d)There is no deadlock in the systemassume a system has 6 identical resources and N processes competing for them. each process can request at most 2 resources. what is the maximum value of N for the system to be deadlock free?Suppose that a multiprogrammed system has a load of N processes with individual execution times of t1, t2, ...,tN. Answer the following questions: a) How would it be possible that the time to complete the N processes could be as small as: maximum (t1, t2, ...,tN)? b) How would it be possible that the total execution time, T > t1+ t2+ ...+tN? In other words, what would cause the total execution time to exceed the sum of individual process execution times?