Given that main memory is composed of three page frames for public use and that a seven-page program (with pages a,b,c,d,e,f,g) requests pages in the following order:
a,b,a,c,d,a,e,f,g,c,b,g
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Sra
4. Given that main memory is composed of three page frames for public use and that a seven page program (with pages a, b, c, d, e, f, g) requests pages in the following order:
a, b, a c, d, a, e, f, g, c, b, g
a. Using the FIFO page removal algorithm, do a page trace analysis indicating page faults with asterisks (*). Then compute the failure and success ratios.
b. Increase the size of memory so it contains four page frames for public used. Using the same page requests as above and FIFO do another page trace analysis and compute the failure and success ratios.
c. Did the result correspond with your intuition? Explain
To determine the page frames that will be occupied in main memory for the given program, we can use the FIFO (First-In-First-Out) page replacement algorithm. This algorithm replaces the oldest page in memory when a new page needs to be loaded.
Let's go step by step to track the page frames in main memory for the program:
1. Initially, the page frames in main memory are empty: [ , , ]
The program requests page "a". The page frame in main memory becomes: [a, , ]
2. The program requests page "b". As page "a" is already in main memory, no page replacement is required. The page frames in main memory remain the same: [a, b, ]
3. The program requests page "a" again. As page "a" is already in main memory, no page replacement is required. The page frames in main memory remain the same: [a, b, ]
4. The program requests page "c". The page frame in main memory becomes: [c, b, ]
5. The program requests page "d". The page frame in main memory becomes: [c, d, ]
6. The program requests page "a" again. The page frame in main memory becomes: [c, d, a]
7. The program requests page "e". The page frame in main memory becomes: [c, d, e]
8. The program requests page "f". The page frame in main memory becomes: [c, d, f]
9. The program requests page "g". The page frame in main memory becomes: [c, d, g]
10. The program requests page "c" again. As page "c" is already in main memory, no page replacement is required. The page frames in main memory remain the same: [c, d, g]
11. The program requests page "b" again. The page frame in main memory becomes: [b, d, g]
12. The program requests page "g" again. As page "g" is already in main memory, no page replacement is required. The page frames in main memory remain the same: [b, d, g]
So, the final configuration of page frames in main memory for the given program would be: [b, d, g].