GATE 2017 CS – Question 35
Consider a two-level cache hierarchy with L1 and L2 caches. An application incurs 1.4 memory accesses per instruction on average. For this application, the miss rate of L1 cache is 0.1; the L2 cache experiences, on average, 7 misses per 1000 instructions. The miss rate of L2 expressed correct to two decimal places is ________.
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Correct answer: 0.05 to 0.05
Explanation
L1 misses per instruction are $1.4 \times 0.1 = 0.14$, and these are the accesses that reach L2. L2 misses are $\frac{7}{1000} = 0.007$ per instruction. So the L2 miss rate is $\frac{0.007}{0.14} = 0.05$.