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I- Paging and Segmentation:
A- In a table format, compare between segmentation and virtual memory organizations in terms of the memory structure, advantages, and disadvantages. Which approach would better support the needs of modern operating environment? Why?
II- File System
A-Please answer Only Two of the following questions that are related to the file system:
1-In table format, compare between online backup and back up cycle methods in terms of basic idea, advantages, and disadvantages.
2-In table format, discuss the advantages, disadvantages, and the performance of the bit map space management approach when it is used for the main memory and the disk.
3- In table format, compare between the contiguous allocation and the I-nodes file implementation approaches in terms of basic idea, advantages, and disadvantages.
B- What is file system reliability? Explain the roles of error handling, back up, and file checker methods in supporting the file system reliability?
C-A file system checker has built up its counters as shown next
Block# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
In-use 1 0 1 0 1 1 1 3 1 0 1 1 1 1 0 1
Free 0 2 0 0 0 0 0 0 0 1 0 0 0 1 1 0
Discuss ALL the errors shown in the above counters and the corresponding solutions.
A- Given the sequence of resource requests below, draw the resource allocation graph and answer the following questions:
– Process A is holding resource S and is requesting resource X.
– Process B is holding resources X, Y and is requesting resource W.
– Process C is holding resource W and is requesting resource Z.
– Process D is holding resource Z and is requesting resource Y and S.
1- List the reasons which causes deadlock to occur in multiprogramming environment.
2-Discuss how can the deadlock detection algorithm for one resource find out if a deadlock exists in the above sequence?
3- List the deadlocked processes.
4- Discuss at least two possible recovery solutions. Which one is better? Why?5- List the recovery process-scheduling sequence corresponding to each solution given in the question above.
B- Name a proper method to be used for each of the following cases: Banker’s algorithm
– Deadlock avoidance for multiprogramming system.
– Deadlock recovery for real-time system.
– Disk head scheduling for busy system.
– File system implementation for batch applications.
– Data transfer method for Database applications.
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C- Consider a system state which consists of the set of running processes A, B, C, D, and E. Assume that the system has four different types of resources R1, R2, R3, and R4. The total numbers of resource copies available in the system are: 6, 4, 4, and 2 in order. The maximum claim and the current resources allocation tables are given below.
Process R1 R2 R3 R4
A 3 2 2 1
B 4 2 2 2
C 2 2 1 0
D 3 2 2 2
E 2 3 1 1
Maximum Claim Table
Process R1 R2 R3 R4
A 2 0 1 1
B 1 1 1 0
C 1 1 0 0
D 1 0 1 0
E 0 1 0 1
Current Allocation Table
1- List the resource allocation table for each individual resource type.
2- Is the current system state safe? Why?
3- Answer the above question if D requests a copy of R4 and another copy of R2.
Answer question number 2above if C requests a copy of R1 and at the same time B reserved a copy of R3.
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