6. Consider a system with five processes, P1, P2, P3, P4 and P5, and four resources, R1, R2, R3, and R4. Each process requests and releases resources in the order shown in the table below. P1: R1, R2 P2:R2, R3 P3:R3, R4 P4:R1, R2 P5:R2, R3 By drawing and using the resource allocation graph method, determine if the system is in a deadlock state. If a deadlock exists, identify the processes that are involved in the

6. Consider a system with five processes, P1, P2, P3, P4 and P5, and four resources, R1, R2, R3, and R4. Each process requests and releases resources in the order shown in the table below. P1: R1, R2 P2:R2, R3 P3:R3, R4 P4:R1, R2 P5:R2, R3 By drawing and using the resource allocation graph method, determine if the system is in a deadlock state. If a deadlock exists, identify the processes that are involved in the

Operations Research : Applications and Algorithms

4th Edition

ISBN:9780534380588

Author:Wayne L. Winston

Publisher:Wayne L. Winston

Chapter20: Queuing Theory

Section: Chapter Questions

Problem 17RP

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Suppose a system has 5 processes, P = {P1, P2, P3, P4, P5}, and 4 resources, R = {R1, R2, R3, R4}, where there are 2 instances of R1, 1 instance of R2, 3 instances of R3, and 3 instances of R4. The current state of the system is defined by the following requests and assignments: P1 is requesting an instance of R3 and has been assigned an instance of R2; P2 is requesting an instance of R1 and has been assigned an instance of R3; P3 is requesting an instance of R4 and has been assigned an instance of R1 and an instance of R3; P4 is requesting an instance of R3; P5 is requesting an instance of R2 and has been assigned an instance of R4. Is there deadlock in this system? (Explicitly state yes, there’s deadlock or no, there isn’t.) If applicable, draw a wait-for graph or resource-allocation graph, and use the appropriate graph to justify your answer. If you conclude there is no deadlock, your justification should contain a sequence of execution for the processes which shows that…
Hey, I have already received a good answer to this question but I am looking for greater detail to be provided. There are three processes P1, P2 and P3 are running in a system with 3 instances of a resource R1, 2 instances of a resource R2, and 2 instances of a resource R3. At a given time the allocation matrix is: A = [{1, 1, 1} { 0, 1, 0} { 1, 0, 0 }] Assume that the maximum matrix is M = [ {2,2,1} {1,1,1} {3,1,0}] While in this state, a new process P4 is created which requires at most 2 instances of R1 and one instance of R2. This process initially requests one instance of R1 to be allocated to it. Using the Banker’s algorithm, determine whether this request can be granted or must be refused.
Q3. Consider a system with five processes P0, P1, P2, P3 and P4 and four resources types A, B, C and D. Resource type A has 4 instances, resource type B has 3 instances, resource type C has 1 instance and resource type D has 2 instances. P0 holds an instance of A and requests an instance of B and D. P1 holds an instance of B and requests an instance of A and C. P2 holds an instance of C and requests an instance of A. P3 holds an instance of D and requests an instance of B and C. P4 holds an instance of A. Draw a directed resources allocation graph to represent the above system state.
Consider a computer system which 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 any way that is, two in one shot or one by one. The system always satisfies a request for a resource if enough resources are available. If the processes don't request any other kind of resource, show that the system never deadlocks?
Draw a resource allocation graph for the following processes and resources. There are four processes running (P1, P2, P3 and P4) and four resources each with single instance (R1, R2, R3 and R4). P1 is holding R4 and requesting R2. P2 is holding R3 and requesting R4. P3 is holding R2 and requesting R1. P4 is holing R1. Is it a deadlock situation?
"Semaphore' may be used also to control the flow of execution. Consider the following situation: P and P2 are two concurrent processes; P executes statement si and P2 executes statement s2. Use semaphores with the wait() and the signal() system calls to impose this flow of execution: s1 must be execute AFTER s2. Make a simulation to justify your answer (no point without a valid simulation).
Consider a system with three processes (P1, P2, and P3) and four resources (R1 has one instance, R2 has two instances, R3 has one instance, and R4 has three instances). The Snapshot at time Tx has the following situation: P1 holds one instance from Resource R2 and Request Resource R1 P2 holds Resource R1, one instance from Resource R2 and Request Resource R3 P3 holds Resource R3 and Request one instance from Resource R2 Draw the Resource Allocation Graph, then check if the system in safe state or not? If yes? What is the safe sequence?
Consider a system with seven processes, A though G, and six resources, R through W. The state of which resources are currently owned and which ones are currently being requested is as follows: 1. ProcessA holds R and wants S. 2. Process B holds nothing but wants T. 3. Process C holds nothing but wants S. 4. Process D holds U and wants S and T. 5. Process E holds T and wants V. 6. Process F holds W and wants S. 7. Process G holds V and wants U. Which of the following statements is true O There is no deadlock O There is deadlock, and it involves processes D, E, and G only O There is deadlock, and it involves processes A, D, and G only O There is deadlock, and it involves processes A, D, E, F, and G only.
A real-time system executing four different periodic tasks Ti(pt) is given with p and t representing the period and the execution time of the task, respectively. Each task's deadline matches its period p. The system is executing the following set of tasks: S = {T₁(10, 2), T₂(4, 1), T3(10, 3), T4(7, 1)}. Is this real-time system schedulable under Rate-Monotonic (RM) scheduling? Is this real-time system schedulable under Earliest Deadline First (EDF) scheduling? Explain your answers using the concept of the overall CPU utilization.
Please provide the correct answer for this question that is incorrect, explain why my answer is wrong and what I can do differently next time so that I can do better next time.
Consider a computer system with three users: Alice, Bob, and Cindy. Alice owns file X, and Bob and Cindy can read it. Bob owns file Y, and Cindy can read and write the file Y, but Alice can only read it. Cindy owns file Z, but neither Alice nor Bob can read or write it. If a user owns a file, he/she can also execute the file. Create the ACM (access control matrix) of the system Show the ACL and CL of the ACM Now Cindy allows Alice to read Z, Alice removes Bob's ability to read X, and Bob removes all the rights of Alice and Cindy to Y. Show the ACM after these changes.
Draw a model in BPMN that can produce every possible execution sequence that includes tasks {p, q, r,s, t}. Discuss the fitness and precision of this model with respect to the workflow log {<p, q, r, s, t>,<p, r, q, s, t>}. Draw a process model that would have perfect fitness and perfect precision with respectto this workflow log. Would the alpha-Algorithm produce this model with perfect fitness and precision? (Business 2710 - Modeling and Implementing Business Processes question.)