Applied Test Series

Question

The cache takes 2 cycles to access and has a 5% miss rate, main memory takes 100 cycles to access and has an 8% miss rate, and the disk takes 10,000 cycles to access. The average memory access time for a given system is____ (in cycles)

Answer 1

AMAT = Hit time + Miss Rate * Miss Penalty

           = 2 + 0.05 (100 + 0.08*10,000)

           = 2 + 0.05 (100 + 800)

           = 2 + 45

           = 47