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In a paged memory management algorithm, the hit ratio is 70%. If it takes 30 nanoseconds to search Translation Lookaside Buffer (TLB) and 100 nanoseconds (ns) to access memory, the effective memory access time is
Correct Answer: D
Question 616 Explanation:
Given data,
— Hit ratio=70%
=70/100
=0.7
— Miss ratio=(1-Hit ratio)
=(1-0.7)
=0.3
— TLB search time=30ns
— Access memory=100ns
— Effective access memory=?
Step-1: [ Hit ratio*(TLB Search time+Access memory) +
Miss ratio*(TLB Search time+2*Access memory) ]
= 0.7*(30+100) + 0.3*(30+2*100)
= 0.7*(130) + 0.3*(30+200)
= 0.7*130 + 0.3*230
= 91 + 69
= 160
— Hit ratio=70%
=70/100
=0.7
— Miss ratio=(1-Hit ratio)
=(1-0.7)
=0.3
— TLB search time=30ns
— Access memory=100ns
— Effective access memory=?
Step-1: [ Hit ratio*(TLB Search time+Access memory) +
Miss ratio*(TLB Search time+2*Access memory) ]
= 0.7*(30+100) + 0.3*(30+2*100)
= 0.7*(130) + 0.3*(30+200)
= 0.7*130 + 0.3*230
= 91 + 69
= 160
91 ns
69 ns
200 ns
160 ns
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