Question

What is the average memory access time for a machine with a cache hit rate of 75 % and cache access time of 6ns and main memory access time of 1000ns when-Hierarchical access memory organization is used.

Answer 1

Answer:

Hit ratio of cache = Hcache = 0.8

Tcache = 30 ns

Tmemory = 150 ns

CPU access time = Hcache * Tcache + (1 – Hcache)(Tcache + Tmemory) = 0.8 * 30 + 0.2 * (30 + 150) = 60 ns

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