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Previous Year Question (PYQs)

Given memory access time as $p$ nanoseconds and additional $q$ nanoseconds for handling the page fault. What is the effective memory access time if a page fault occurs once for every $100$ instructions?




Solution

Normal memory access time is $p$ nanoseconds.

Page fault occurs once for every $100$ instructions.

So, average page fault overhead per instruction is:

$\frac{q}{100}$

Therefore, effective memory access time is:

$p+\frac{q}{100}$

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