Question: Assume a hierarchical memory system having a joint instruction/data cache with a memory - access cost of 10 ns on a hit and 90 ns

Assume a hierarchical memory system having a joint instruction/data cache with a memory - access cost of 10 ns on a hit and 90 ns on a miss. An alternative design without hierarchical memory architecture has a memory - access cost of 70 ns. What is the minimum cache - hit percentage that would make the hierarchical memory system useful?

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