Code No. 2158 / O FACULTY OF INFORMATICS B.E. 3/4 (IT) II Semester (Old) Examination, May 2013 Subject: Real Time Systems Time: 3 Hours
Max.Marks: 75
Note : Answer all questions from Part A. Answer any Five questions from Part B. PART – A (25 Marks) 1. What is an asynchronous and unpredictable type of real-time application? Give an example.
(2)
2. Give one example each for ‘soft deadline’ and ‘hard deadline’.
(2)
3. Describe ‘Periodic Task Model’ in brief.
(3)
4. Distinguish between ‘Precedence Graph’ and ‘Task Graph’.
(3)
5. List the requirements of clock-driven schedulers.
(3)
6. Give two uses of watch dog timer mechanism.
(2)
7. Distinguish between ‘Pessimistic Concurrency Control’ and ‘Optimistic Concurrency Control’.
(3)
8. List factors that make it difficult to predict the response times of transactions in real-time databases.
(2)
9. Define ‘Fault Latency’. Is ‘Error’ a manifestation of a fault?
(2)
10. Define ‘Time Redundancy’ and ‘Information Redundancy’.
(2)
PART – B (50 Marks) 11. Describe a reference model of real-time systems. Write a brief note on feasibility, optimality and performance measures.
(10)
12. Describe an application system using an example task graph.
(10)
13. Discuss ‘Time Services’ in real-time applications.
(10)
14. Discuss real-time POSIX signals.
(10)
15. Explain why EDF does not work well in heavily-loaded real-time database systems and why the AED algorithm can improve the success rate. Will AED perform better than EDF for non-database real-time applications?
(10)
16. Write a note on concurrency control issues in real-time databases.
(10)
17. What is a Fault? Explain implementation of backward error recovery.
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