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If it takes 50ns to search associative registers and also about 100ns to get access to main memory then find out the % of slowdown in memory access time?(Given hit ratio 90%)-

A)60

B)75

C)20

D)90

1 Answer

3 3 votes
considering when hit ratio is 90%

average memory access time =0.9(50)+0.1(100+50)=60

comparing it with when hit ratio is 100%:

memory access time is 50

slow down =(60-50)/50=0.2

0.2 * 100=20%
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