Consider a system with 2 level cache. Access times of Level 1 cache, Level 2 cache and main 0.5 ns, 5 ns 100 ns memory are and respectively. The hit rates of Level 1 and Level 2 caches are 0.7 and 0.8 , respectively. What is the average access time of the system ignoring the search time within the cache?
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Correct answer: B. 7.55 ns
Explanation
With simultaneous lookup: 0.7 × 0.5 + 0.3 × 0.8 × 5 + 0.3 × 0.2 × 100 = 0.35 + 1.2 + 6 = 7.55 ns.
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