Question

Consider the following page reference string :

1 2 3 4 2 1 5 6 2 1 2 3 7 6 3 2 1 2 3 6
iv) For FIFO page replacement algorithms with 4 frames, the number of page faults is :
a) 16
b) 15
c) 14
d) 11

Answer 1

For the FIFO page replacement algorithm with 4 frames, the number of page faults is c) 14.

Step-by-step explanation:

The FIFO (First-In-First-Out) page replacement algorithm works by replacing the oldest page in memory when a page fault occurs. Analyzing the given page reference string with 4 frames, the sequence of page faults is as follows: 1, 2, 3, 4, 5, 6, 7. Once the frames are filled, subsequent references result in page faults. Counting these occurrences, the total number of page faults is 14.

Each page number represents a memory reference, and the algorithm replaces the oldest page when a new one is encountered, leading to additional faults. Therefore, option c) 14 is the correct answer for the given scenario.

Option C is the answer.