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Assume that for a certain processor, a read request takes 50 ns on a cache miss and 5 ns on a cache hit.

Suppose while running a program, it was observed that 80% of the processor's read requests result in a cache hit. The average read access time in nanoseconds is _____.

Now, I know that the answer is 0.8(5) + 0.2(50) = 14 ns.

But, there’s another way of calculating which we usually use for multilevel caches, which is given as:

T(avg) = Hit Time of L1 + MissRate(L1)*(Miss Penalty for L1)

If we use a similar logic for this question,

T(avg) =  5 + 0.2*(50), which gives us 15.

So, how do we know which formula do we have to use in which context?
in CO & Architecture by (373 points) | 25 views
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In general, if we deal with searching time then using second type formula is by default.

But in this question, they are avoiding searching time..  So first type formula is by default

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