• Attempt any five questions.
• All questions carry equal marks.
What are the five major activities of an operating system in regards to memory management?
List the functions of OS. How operating system perform management task in a system?
Give an example of an application where data should be accessed sequentially and randomly.
Disk with 5000 cylinders at cylinder 143, previous at 125. Find total distance for SSTF, SCAN and LOOK for given queue.
Consider variant of RR where entries in ready queue are pointers to PCB. Effect of two pointers to same process? Major advantage and drawback?
How many page faults for optimal page replacement with 4 frames for given reference string?
Process P wants to wait for two messages from mailbox A and B. What sequence of send/receive?
Why use interrupt-driven I/O for single serial port but polling I/O for terminal concentrator?
What aspects of a distributed system would you select for a system running on a totally reliable network?
List three possible types of failures in a distributed system.
Define a semaphore for dining philosopher's problem.
Describe method for process migration across different architectures running same OS and different OS.
Explain concurrency controls. Differences between real and virtual concurrency?
How process is differing from program? Describe process transition diagram in detail.
Write short notes on (any two): a) Deadlock prevention and avoidance b) Kernel architecture in Unix c) System calls.
