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A processor has an L1 cache with 1 ns hit time and a 10% miss rate; the L2 cache has a 10 ns access time and a local miss rate of 20%; main…

1375Medium DSSSB TGT Computer Science 0 replies 1 views
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A processor has an L1 cache with 1 ns hit time and a 10% miss rate; the L2 cache has a 10 ns access time and a local miss rate of 20%; main memory takes 100 ns. The average memory access time is

  • A2 ns
  • B13 ns
  • C5 ns
  • D4 ns
Correct answer: D

Explanation

AMAT = 1 + 0.1 × (10 + 0.2 × 100) = 1 + 0.1 × 30 = 4 ns.
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