solve computer architecture problem 1. A computer has a cache, main memory and d

Question

solve computer architecture problem

1. A computer has a cache, main memory and disk (unsed for virtual memory). If a referenced word s in the cache, it requires 20 ns to access it. tit is in main memory, but not in the cache, then it requires 60 ns to load it into the cache, then pass on the word to the CPU. If the referenced word is not in the cache, or in main memory, but is on the disk, it requires 12 ms to fetch the work from the disk, then an additional 60 es to copy it into the cache, then pass on the word to the CPU. The cache hit ratio is 0.9 and the main memory hit ratio is O6 a. What is the page fault ratio? b. W what is the average time Insl required to access a referenced word in this system? ?. (Mnt draw a dagram of the architecture

Explanation / Answer

a)
Cahche miss ratio: 0.1
Memory miss ratio: 0.4

b)
Average acceess time = 0.9*20 + 0.1* (0.6*80+0.4*92) = 26.48ns

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