-
-
Virtual GATE @virtualgate added an Example10 Dec 2015
A memory has got write through cache, primary memory
A memory has got write through cache, primary memory, and secondary memory. The access time of cache is 7 ns and 85% hit rate. The main memory has got the hit rate of 99.8% with access time of 117 ns. The average access time of the system is
(A) 20.5 ns
(B) 24.9 ns
(C) 23.5 ns
(D) 19.5 ns
Time for accessing from cache for 100 memory Tc = 85 × 7 + 15 × 117 = 2380 ns
So, Taverage = 2380/100 ≈ 23.5 ns
Here hit rate of primary memory is considered as 100%?
yes ri8
Why are you not considering access time of cache when there is a cache miss, in that case also cache will be accessed.??
Pages