Question

The memory access time is 10 ns when there is a hit in cache and the memory access time is 100 ns when miss in cache but no page fault. The page fault service time is $3\mu sec$. The cache hit ratio is 90% and page fault rate is 5%. The effective memory access time is ________ ns.

• A. 33.5
• B. 63.5
• C. 53.5
• D. 43.5

Answer 1

The correct option is A 33.5

option (a)

0.9 * 10 + 0.1 [0.95 * 100 + 0.05 * 3000]

= 9 + 0.1 [95 + 150]

= 9 + 24.5

= 33.5 ns