(a) Given a 100 MHz machine with a with a miss penalty of 20 cycles, a hit time of 2 cycles, and ...
(a) Given a 100 MHz machine with a with a miss penalty of 20
cycles, a hit time of 2 cycles, and a miss rate of 5%, calculate
the average memory access time (AMAT).
(b) Suppose doubling the size of the cache decrease the miss rate
to 3%, but causes the hit time to increases to 3 cycles and the
miss penalty to increase to 21 cycles. What is the
AMAT of the new machine?
Homework Answers
a) Average memory-access time (AMAT) = Hit time + Miss rate x Miss penalty (ns or clocks)
AMAT = 2 + 0.05 * 20 = 3 clock cycles
b) Average memory-access time (AMAT) = Hit time + Miss rate x Miss penalty
AMAT = 3 + 0.03 * 21 = 3.63 clock cycles
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