GATE | GATE-CS-2015 (Set 2) | Question 34

Assume that for a certain processor, a read request takes 50 nanoseconds on a cache miss and 5 nanoseconds 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____________.
(A) 10
(B) 12
(C) 13
(D) 14

Answer: (D)
Explanation:

The average read access time in nanoseconds
= 0.8 * 5 + 0.2*50
= 14

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