Consider a computer system that has 8 identical resources and P processes competing for them. Each process can request at most 2 resources. What is the minimum value of P that could lead to a deadlock?
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- Consider a system consisting of m resources of the same type being shared by n processes, n > m. Each process has a maximum need of m/2 resources. Initially, each process has no resource requests. A process can request or release only one resource at a time. With n=3k and m=2k, for some integer k, show that the system is deadlock free.Consider a computer system with 3 processes and one resource with 4 instances. Each process needs at most 2 resource instances. Is a deadlock possible in this system? Justify your answer.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?
- assume 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?Consider a system with four identical resources that are shared by three processes, with the maximum number of resources required by any one process being two. Show that there are no deadlocks in the system.Consider a system consisting of six resources of the same type that are shared by four processes, each of which needs at most three resources. Show that the system is deadlock free.
- Consider a system consisting of four resources of the same type that are shared by three processes, each of which needs at most two resources. Show that the system is deadlock free.Consider a system with four resources of the same sort that are shared by three processes, each of which requires no more than two resources. Demonstrate that the system is free of deadlocks.On a computer system with one processor (CPU), and N (N> 1) processes present in the system, what is the maximum number of processes that can be in the Running, and in the Blocked states at any given time? Assume 5-state model for process states.
- In the picture attached, the Say that the system is running 3 jobs, A, B, and C, and that all of them are CPU-intensive (i.e., each one does one infinitely long CPU burst). The system begins with A on the CPU at the beginning its time quantum while B and C are in the Ready Queue, in that order. a) Show the execution pattern (as a string of A’s, B’s, C’, and o’s) assuming that the scheduler time quantum is equal to 4 ms. Show the execution for more than 20ms (but less than 30ms). b) In the long run (i.e, assuming jobs don’t ever terminate), what percentage of the CPU time is wasted doing context-switching/scheduling? The answers I came up with is as follows: a) AAAAoBBBoCCCoAAAoBBBoCCCoAAA, because for the first 4ms, A gets to execute it's full time quantum, however, when context-switching to the next job, the switch is included in the time quantum. b) 2.77% spent context switching, divide the number of o's by the total amount of runtime.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 systemConsider the following set of processes A, B, C, D with the following CPU burst time and I/O. Find the average waiting time with RR of quantum 10ms and context switch time=2ms. What is the average waiting time? Write the waiting time for processes A,B,C,D.