ACE booklet -II, Page no-66,Q.15

Question

In a cache organized memory there exist $30$% of compulsory misses, $10$% capacity misses, $12$% conflict misses. If cache is fully associative Find the average access time? ($t_{c} = 10ns$, $t_{m} = 100ns$)

a). $10ns$                b). $40ns$                   c). $50ns$                  d). $62ns$

Comments

50 nsec ??

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50 is right since no conflict miss in full associative mapping....

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@Gabbar @kunal+chalotra Can you please answer in detailed way.

Answer 1

there is no conflict miss in fully set associativity mapping

so total number of misses = 30 + 10 =40% = .4

effective access time = 10*.6 + .4 * (100+10)

                                    = 50ns