Programming Language Pragmatics, Fourth Edition
Programming Language Pragmatics, Fourth Edition
4th Edition
ISBN: 9780124104099
Author: Michael L. Scott
Publisher: Elsevier Science
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Chapter 5, Problem 15E

Explanation of Solution

Contribution of last-level cache misses:

Given is:

Machine contains 25% of the typical instruction mix

15% of loads miss in the last level of on-chip cache

120 cycle’s penalty to reach main memory

Determining the contribution of last-level cache misses to the average number of cycles per instruction is as follows:

Average number of cycles per instruction = (instruction mix ×

Explanation of Solution

Effect on cycles per instruction:

Given is:

Machine contains 25% of the typical instruction mix

15% of loads miss in the last level of on-chip cache

120 cycle’s penalty to reach main memory

Off-chip (L3 or L4) caches satisfy 90% of the misses from the last-level on-chip at the penalty of 30 cycles.

Determining effect on cycles per instruction is as follows:

Effect on cycles per instruction = (instruction mix ×load miss in the last level of on-chip cache ×((off-chip cache × new penalty)+(0.1 × old penalty)))= 0

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