NIMCET 2021 — Computer PYQ

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Question

NIMCET 2021 — Computer PYQ

NIMCET | Computer | 2021

The cache memory is more effective because of

Choose the correct answer:

Explanation

Performance Equation

The effectiveness of cache is measured by the Average Memory Access Time (AMAT):

AMAT = T_{cache} + (1 - H) \times T_{miss\_penalty}

Where:

$T_{cache}$ = Time to access the cache.
$H$ = Hit Ratio (probability that the data is in the cache).
$(1 - H)$ = Miss Ratio.
$T_{miss\_penalty}$ = Time to fetch data from main memory.

Speed Comparison

The effectiveness is also driven by the speed advantage of cache over main memory:

T_{cache} \ll T_{RAM}

Final Answer

Cache memory is more effective because of:

\mathbf{\text{Locality of Reference (Temporal and Spatial)}}