2006 December UGC NET Paper 1
February 26, 2025ICT
February 27, 2025UGC-NET DEC-2019 Part-2
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Question 28
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Consider a paging system where translation lookaside 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?
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?
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110 nanoseconds
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116 nanoseconds
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200 nanoseconds
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100 nanoseconds
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Question 28 Explanation:
Tavg = TLB access time + miss ratio of TLB × memory access time + memory access time
= 20 + 0.2 × 80 + 80
= 20 + 16 + 80
= 116 ms
= 20 + 0.2 × 80 + 80
= 20 + 16 + 80
= 116 ms
Correct Answer: B
Question 28 Explanation:
Tavg = TLB access time + miss ratio of TLB × memory access time + memory access time
= 20 + 0.2 × 80 + 80
= 20 + 16 + 80
= 116 ms
= 20 + 0.2 × 80 + 80
= 20 + 16 + 80
= 116 ms