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Disadvantage: if a program happens to reference words repeatedly from two different blocks that map into the same line, then the blocks will be continually swapped in the cache, and the hit ratio will be low. Thus, the performance isn't optimal compared to the other techniques.
Advantage: It's easy to implement.
Wiki User
∙ 12y ago
Wiki User
∙ 10y ago•Advantages
-Almost as simple to build as a
direct-mapped cache.
- -Only n comparators are
- needed for an n-way set
- associative cache. For 2-way
- set-associative, only 2
- comparators are needed to
- compare tags.
-Supports temporal locality by
having full associativity within
a set.
•Disadvantages -Not as good as fully-
associative cache in
supporting temporal locality.
-For LRU schemes, because of
small associativity, actually
possible to have 0% hit rate
for temporally local data.
-E.g. If our accesses are A1 A2
A3 A1 A2 A3, and if A1, A2
and A3 map to the same
2-way set, then hit rate is 0%
as subsequent accesses
replace previous accesses in
the LRU scheme.
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