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Previous Year Question (PYQs)

A computer system with cache access time of 100 ns, a main memory access time of 1100 ns, and a hit ratio of 0.9. The average access time would be:





Solution

Average Memory Access Time:


$AMAT = Hit\ Time + Miss\ Rate \times Miss\ Penalty$


Hit time = 100 ns

Miss rate = $1 - 0.9 = 0.1$


Miss penalty = $1100 - 100 = 1000$


So,


$AMAT = 100 + 0.1 \times 1000$


$AMAT = 100 + 100 = 200\ ns$


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