Consider a memory hierarchy with the following information: Hierarchy = primary cache, secondary cache, main memory tcl = Access time to primary cache = 5 ns tc2 = Access time to secondary cache = 20 ns tc3 = Access time to main memory = 70 ns h1 = hit ratio to primary cache = 0.9 h2 = hit ratio to secondary cache = 0.95 h3 = hit ratio to main memory =1 What is the average access time for this memory hierarchy?

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Consider a memory hierarchy with the following information:
Hierarchy = primary cache, secondary cache, main memory
tc1= Access time to primary cache = 5 ns
tc2 = Access time to secondary cache = 20 ns
tc3 = Access time to main memory = 70 ns
h1 = hit ratio to primary cache = 0.9
h2 = hit ratio to secondary cache = 0.95
h3 = hit ratio to main memory = 1
What is the average access time for this memory hierarchy?
Transcribed Image Text:Consider a memory hierarchy with the following information: Hierarchy = primary cache, secondary cache, main memory tc1= Access time to primary cache = 5 ns tc2 = Access time to secondary cache = 20 ns tc3 = Access time to main memory = 70 ns h1 = hit ratio to primary cache = 0.9 h2 = hit ratio to secondary cache = 0.95 h3 = hit ratio to main memory = 1 What is the average access time for this memory hierarchy?
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