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Course Code : MCS-041 Course Title : Operating Systems Assignment Number : MCA(IV)/041/Assignment/15-16 Maximum Marks : 100 Weightage : 25% Last Dates for Submission : 15th October, 2015 (For July 2015 Session) 15th April, 2016 (For January 2016 Session) This assignment has four questions. Answer all questions. Each question is of 20 marks. Rest 20 marks are for viva voce. You may use illustrations and diagrams to enhance the explanations. Please go through the guidelines regarding assignments given in the Programme Guide.
1. Consider the following jobs: Job #
Arrival time Run time A 0 6 B 2 4 C 3 5 D 5 4 (15 Marks) (a) Using the SJF method, compute the completion times of the above jobs, average turn around time and average waiting time. (b) Using the SRTF (Shortest Remaining Time first) method, compute the completion times of the above jobs, the average turn around time and the average waiting time. Note that SRTF is SJF with preemption. (Hint: Completion time - arrival time = turnaround time). (c) Using the Round Robin method (with Quantum = 2), compute the completion times of the above jobs and the average waiting time. 2. (a) Banker's Algorithm is a deadlock avoidance algorithm that checks for safe or unsafe state of a System after allocating resources to a process. When a new process enters into system, it must declare maximum no. of instances of each resource that it may need. After requesting operating system run banker's algorithm to check whether after allocating requested resources, system goes into deadlock state or not. If yes, then it will deny the request of resources made by process else it allocates resources to that process. No. of requested resources (instances of each resource) may not exceed no. of available resources in operating system and when a process completes it must release all the requested and already allocated resources. For implementing Banker's algorithm we should have preknowledge about 3 things: (15 Marks) (i) How many instances of each resource a process could request. (Max) 4 (ii) How many instances of each resource is already allocated to that process(Allocated) (iii)How many instances of each resource is already available(Available). We can calculate need of each process from above information: Need = Max - Allocated. If Need <= Available then request will be accepted otherwise it is denied and it will check for next process in waiting queue. A system is in Safe state if its all processes finish its execution or unsafe if any process is unable to acquire its all requested resources. Write an interactive C program for implementing the Banker's Algorithm. (b) Consider the following page-reference string: 1, 2, 3, 2, 1, 7, 3, 4, 6, 2, 2, 2, 3, 1, 6, 3, 2, 1, 2, 4, 3 How many page faults would occur for following replacement algorithms assuming one, two, three, four, five, six or seven frames? Remember that all frames are initially empty, so your first unique pages will all cost one fault each. (i) LRU replacement. (ii) FIFO replacement. (iii) Optimal replacement (10 Marks) 3. (a) The Linux kernel does not allow paging out kernel memory. What effect does this restriction have on kernel design? What are two advantages and two disadvantages of this design decision? (10 Marks) (b) The Windows 2000 VM manager uses a two-stage process to allocate memory. Identify several ways in which this approach is beneficial. (10 Marks) 4. Discuss in detail the Process management, Memory management, I/O management, File management and Security & Protection in WINDOWS 8.1 Operating System.
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