試題詳解

 T1 = 5 ns (L1-cache)

 T2 = 200 ns (L2-cache)

 T3 = 600 ns (Main memory)

 The local hit rate in each level is H1 = 0.9 (L1-cache), H2 = 0.8 (L2-cache), and H3 = 1 (It is assumed that we can always find the data in main memory). If the average access time (ns) of this memory is K. What is the value of “{Round(K*123)} mod 5” ?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4