Consider a two level cache hierarchy L1 and L2 caches An application incurs 14 memory accesses per instruction on average For this application the miss rate of L1 cache 01 the L2 cache experience on average 7 misses per 1000 instructions The miss rate of L2 expressed correct to two decimal places is gate computer science 2017
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Consider a two-level cache hierarchy L1 and L2 caches. An application incurs 1.4 memory accesses per instruction on average. For this application, the miss rate of L1 cache 0.1, the L2 cache experience on average. 7 misses per 1000 instructions. The miss rate of L2 expressed correct to two decimal places is ______________. -gate computer science 2017

A) 0.05
B) 0.06
C) 0.07
D) 0.08


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Answers

A) 0.05

Explanation:  
Let 1000 instructions generated 121 Therefore, Miss rate of L2 cache = (memory references generated by L2 cache) / (memory references generated by L1 cache) = 7 / 140 = 0.05 Alternate Solution 

On Average, 1.4 memory accesses are required for one instruction execution. 
So, for 1000 instructions, 1400 accesses are needed. 
Number of misses occurred in cache L2 for 1000 instruction = 7/1400 = 0.005 
Miss rate of L2 cache = misses occured in L2 cache / miss rate in L1 cache 
= 0.005 / 0.1 = 0.05 (A)

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