NIMCET 2017 Computer PYQ — Let the memory access time is 10 milliseconds and cache miss rati… | Mathem Solvex | Mathem Solvex
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NIMCET 2017 — Computer PYQ
NIMCET | Computer | 2017
Let the memory access time is 10 milliseconds and cache miss ratio 15% .The effective memory access time is ?
Choose the correct answer:
A.
2 milli seconds
B.
1.5 milli seconds
(Correct Answer)
C.
1.85 micro seconds
D.
1.85 milli seconds
Correct Answer:
1.5 milli seconds
Explanation
Data: Cache Cache = T1=0ms (since not mention) Hit ratio = 15% Hit ratio = 100 Miss ratio = 1−0.85=0.15 Main memory Main memory = T2=10ms Formula: Average memory access time = Tavh=H1T1+(1−H1)(T1+T2) Tavh=T1+(1−H1)(T2) Calculation: Tavh=0+(1−0.85)(10) ∴ Tavh=1.5 milli seconds
Explanation
Data: Cache Cache = T1=0ms (since not mention) Hit ratio = 15% Hit ratio = 100 Miss ratio = 1−0.85=0.15 Main memory Main memory = T2=10ms Formula: Average memory access time = Tavh=H1T1+(1−H1)(T1+T2) Tavh=T1+(1−H1)(T2) Calculation: Tavh=0+(1−0.85)(10) ∴ Tavh=1.5 milli seconds
