OS ASSIGNMENT

PART-A

Answer all Questions

1.      Write short notes on

a). Distributed systems

b). Real Time OS

c). Batch OS

d) Multi Programming

e). Multi tasking.

2.      Explain the need for Page-replacement?

3.      Describe Context-Switching?

4.      Explain Virtual Machine briefly?                                    

PART-B

5.      Consider the following set of processes, with the length of the CPU burst given in milliseconds.

Process	CPU Burst time	Priority
P1	10	3
P2	1	1
P3	2	3
P4	1	4
P5	5	2

All the processes have arrived at time 0. Draw Gantt chart for FCFS, SJF, PRIORITY, RR(Quantum=1) and calculate turn around, waiting time, average turn around, average waiting time for each process of each scheduling algorithm.

                                       (or) 

6.      State the factors on which the performance of the Round Robin CPU scheduling algorithm depends?

7. Define Process states and mention the various states of a process?

                                         (or)

               8. Explain System Calls Briefly?