Operating System Notes | 100% Easy Short Notes | ALLBCA

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Operating System Notes : ALLBCA

Here, allbca provide you very-very important topics of Operating System Notes, for your Sem 4th exam preparation and to increase your knowledge. We are 100% sure, that it will pass you in the Operating System  Exam. And you will have very good marks. Section 'C' contains 15 marks, Section 'B'  7.1/2 marks and Section 'A' 3 marks'Stars' represents the possibility of that particular question arrive in the exam. So read them all carefully.

Section 'C' (15 marks) : Operating System Notes

(Explain for necessary conditions for deadlock to occur with example)

Q2. Consider following ‘Page reference strings 1,2,3…… How many “Page Fault” could occur for following replacement algorithms, assuming four frames. (it is Numerical)
★★★
(a) LRU replacement ?
(b) Optimal replacement ?
(c) FIFO replacement ?

Q3. 'Linked Allocation' methods for files? (merits & drawbacks)
(How does an indexed allocation salve problems of linked allocation scheme)

Q4. “Process Scheduling Algorithm”
(Explain performance ‘criteria’ for ‘scheduling algorithm’)
(a) First Come First Serve ?
(b) Shortest Job First ?
(c) Priority Scheduling ?
(d) Round Robin ?

Q5. 'Semaphor' ? How do they implement mutual exclusion ?

Q6. 'Segmentation' ? (memory segmentation)

Q7. (i) 'Directory Structure' with Ex. ?
(iii) 'Free Space Management' with Ex. ?
(iv) 'Thrashing' ? why occur? working set strategy to deal this problem ?

Q8. 'Fragmentation' ? (Internal/External Fragmentation)

Q9. 'Structure of a disk' with diagram?

Q10. ‘The CPU Burst Time’ requirement of five processes P1,P2,P3,P4 and P5 along with their arrival times at ready queue are shown below:-
★★ (Q10 is Numerical) [Ans1] [Ans2]
(i) Preemptive shortest-job-first scheduling.
(ii) Non-preemptive shortest-job-first scheduling.

Section 'B' (7.1/2 marks)

Q1. How ‘Memory can dynamically allocated’ using ‘first fit’, ‘best fit’, ‘worst fit’ strategies?

Q2. ‘Paging’?

Q3. ‘Critical section problem’? Example?

Q4. ‘Virtual memory’? with diagram?

Section 'A' (3 marks)

Q1. ‘Operating System’? Role? (services are provided by an OS)

Q2. ‘Time Sharing’ System Vs ‘Real Time’ System.

Q4. ‘Resource allocation graph’? Example?

Q5. ‘Batch processing’?

Q6. ‘Handling a page fault’ steps involved?

Q7. ‘Device Management’ (its Function)?

Q8. ‘Protection’ and ‘Security’?

[ Topic= Operating System Notes ]

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