Gateforum Test Series: Operating System - Virtual Memory

Question

Let the page fault probability be 0.6 and page fault service time is 150 ms and time to replace dirty page is 200 ms. In case of a page fault the probability of being dirty is 0.5. If a memory access takes 100 ms. The effective access time is ___ ms?

Comments

you are correct, page fault service time is much much greater than memory access time.

Generally page fault service time is considered in milliseconds and memory access time considered in nanosecond, we can ignore Memory access time in comparison to  Page fault service time.

But in above question both are comparable so we can't ignore that page fault service time does not include memory access time.

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https://gateoverflow.in/148292/os-page-fault-service-time-vs-effective-memory-access-time See this link.

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main memory access time is also added in page fault rate .