GATE CS 2018 Set 1 — Question 20
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Operating System → Memory Management → Demand Paging
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Question
Consider a process executing on an operating system that uses demand paging. The average time for a memory access in the system is units if the corresponding memory page is available in memory, and 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 units.Which one of the following is the correct expression for the page fault rate experienced by the process?
Correct answer
(B) (X - M) / (D - M)
Solution
Let be the page fault rate. The average memory access time is given by the weighted average of the access time when a page is in memory () and when a page fault occurs ():Solving for :Therefore, option (B) is correct.
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