UGC NET Computer Science December 2019 | Question 77

Question 77

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Consider a paging system where translation look aside buffer (TLB) a special type of associative memory is used with hit ratio of 80%. Assume that memory reference takes 80 nanoseconds and reference time to TLB is 20 nanoseconds. What will be the effective memory access time given 80% hit ratio?

1. 1. 110 nanoseconds
2. 2. 116 nanoseconds
3. 3. 200 nanoseconds
4. 4. 100 nanoseconds

Answer : 2. 116 nanoseconds

Explanation

Effective memory access time,
T_avg = TLB access time + miss ratio of TLB × memory access time + memory access time
= 20 + 0.2 × 80 + 80
= 20 + 16 + 80
= 116 ms

So, option 2 is correct answer

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