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Digital Design & Computer Arch.Lecture 22: Amdahl’s Law - Paper Review Assignment

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Digital Design & Computer Arch.Lecture 22: Amdahl’s Law - Paper Review Assignment

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Questions and Answers

What is the main purpose of set associativity in caches?

To reduce the number of conflict misses (correct)

To improve cache access speed

To simplify the cache design

To increase the cache size

What is the key idea behind set associative caches?

Faster access time

Larger tag store

Smaller cache size

Associative memory within the set (correct)

What is the main drawback of a direct-mapped cache?

Simple design

High hit rate

Low conflict misses

Interleaved access pattern leading to 0% hit rate (correct)

How does a 2-way set associative cache differ from a direct-mapped cache?

Blocks with the same index can map to 2 locations Signup and view all the answers

What is the purpose of the $tag$ and $index$ bits in a cache address?

The $tag$ bits identify the cache set, and the $index$ bits identify the block within the set. Signup and view all the answers

What is the main advantage of higher set associativity in caches?

Fewer conflict misses Signup and view all the answers

What is the main disadvantage of higher set associativity in caches?

Slower cache access time Signup and view all the answers

What is the main difference between a direct-mapped cache and a set associative cache?

Set associative caches allow blocks with the same index to map to multiple locations Signup and view all the answers

What is the purpose of the $byte$ in $block$ field in a cache address?

To identify the byte within the block Signup and view all the answers

What is the main reason for conflict misses in a direct-mapped cache?

Interleaved access pattern to blocks with the same index Signup and view all the answers