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Which mapping of cache is inefficient in software viewpoint?

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Which mapping of cache is inefficient in software viewpoint?

(a) fully associative

(b) 2 way associative

(c) 16 way associative

(d) direct mapping

I have been asked this question by my college professor while I was bunking the class.

This intriguing question originated from Size of Cache in division Memory Systems of Embedded Systems

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The correct choice is (d) direct mapping

The best I can explain: The direct mapping cache organization is simple from the hardware design aspects but it is inefficient in the software viewpoint.

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