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Suppose it takes 100 ns to access a page table and 20 ns to access associative memory with a 90% hit rate, the average access time equals :
Correct Answer: B
Question 684 Explanation:
Given data,
— Access page table time=100 ns
— Associate memory=20 ns
— hit ratio=90% = 0.9
— Miss ratio=1-hit ration
= 10% =0.1
— Average Access Time=?
Step-1: AAT= Hit Ratio*Access page table + Miss Ratio*Associate memory
= 0.9*20 + 0.1*100
= 28 ns
— Access page table time=100 ns
— Associate memory=20 ns
— hit ratio=90% = 0.9
— Miss ratio=1-hit ration
= 10% =0.1
— Average Access Time=?
Step-1: AAT= Hit Ratio*Access page table + Miss Ratio*Associate memory
= 0.9*20 + 0.1*100
= 28 ns
20 ns
28 ns
90 ns
100 ns