IIT M november 2016

Question

Memory syatem of a computer is changed from direct Cache to 2-way set assosiative cache.same block size.now what is false

a) capacity increases

2)sequential access does not become faster

3)size increases

4) access time gets faster

Comments

a) False

b) False

c) incomplete (which size it is taking to)

4) True

Answer 1

Capacity increases --- I think he meant the capacity to store the memory blocks it can increase as in direct mapped only the particular block is stored by mod but in 2 set associativity twice the number of blocks can be stored when compared with set to a block --so true

Sequential access has nothing to do with associativity ----so true

Size increases --- the capacity of cache cannot increase .----so false

Access time gets faster --- but due to associativity the tag bits which are to be compared will be more than the direct cache so the access time will be slower ----so false