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1Conceptual Review

  1. Question

Solution

Solution

2Short Exercises

  1. True/False: Decreasing block size to increase the number of blocks held by the cache improves the program speed for all programs.

Solution

False. Similar to the previous question, the impact depends on the program. If a program iterates through contiguous memory (like an array), having larger block sizes with fewer blocks may be beneficial as each block contains more contiguous data. For instance, if Cache A has 10 blocks and a block size of 8 bytes while Cache B has 20 block and a block size of 4 bytes, and we loop through an array of 80 characters, Cache A will experience 10 cache misses and 70 hits, while Cache B will have 20 misses and 60 hits.

L28 Caches III
Precheck Summary
L29 Caches IV
Set-Associative Caches