Operating-Systems
October 11, 2023Operating-Systems
October 11, 2023Operating-Systems
| Question 12 |
Consider a process executing on an operating system that uses demand paging. The average time for a memory access in the system is M units if the corresponding memory page is available in memory and D units if the memory access causes a page fault. It has been experimentally measured that the average time taken for a memory access in the process is X units.
Which one of the following is the correct expression for the page fault rate experienced by the process?
| (D-M)/(X-M) | |
| (X-M)/(D-M) | |
| (D-X)/(D-M) | |
| (X-M)/(D-X) |
Question 12 Explanation:
Let ‘P’ be page fault rate then, average memory access time
X = (1 – P)M + D × P
X = M ∙ PM + DP
(X – M) = P(D – M)
⇒ P = (X – M) / (D – M)
X = (1 – P)M + D × P
X = M ∙ PM + DP
(X – M) = P(D – M)
⇒ P = (X – M) / (D – M)
Correct Answer: B
Question 12 Explanation:
Let ‘P’ be page fault rate then, average memory access time
X = (1 – P)M + D × P
X = M ∙ PM + DP
(X – M) = P(D – M)
⇒ P = (X – M) / (D – M)
X = (1 – P)M + D × P
X = M ∙ PM + DP
(X – M) = P(D – M)
⇒ P = (X – M) / (D – M)
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