Consider a two-level cache hierarchy with L1 and L2 caches. An application…
2017
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
Solution: compute the L2 miss rate as the fraction of L1 misses that also miss in L2.
Step 1: L1 misses per instruction = memory accesses per instruction × L1 miss rate = 1.4 × 0.1 = 0.14.
Step 2: L2 misses per instruction = 7 misses per 1000 instructions = 7/1000 = 0.007.
Step 3: L2 miss rate = (L2 misses per instruction) / (L1 misses per instruction) = 0.007 / 0.14 = 0.05.
Answer: 0.05 (which is 5.00%).
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