Write a C program that measures your cache performance and memory hierarchy.

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We want to derive the following parameters of our CPU
experimentally:
• The number of caches
• The sizes of all caches
• The access latencies of all caches and main memory
• The cache line size

What I have tried:

sizes = [1k, 4k, 256K, ...]
foreach size in sizes
create array of `size`

start timer
for i = 0 to n // just keep accessing array
arr[(i * 16) % arr.length]++ // i * 16 supposed to modify every cache line ... see link
record/print time

Posted 6-May-18 11:03am

Member 13814317

Updated 7-May-18 5:54am

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Patrice T 6-May-18 17:23pm

What is the question ?

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Rick York · Answer 1 · 2018-05-07T05:55:00

This is virtually impossible to measure experimentally. That is because all of these things are transparent to an application, as they should be. If they aren't then the chip was not designed properly.

There are a few apps that will display this information for you, like CPU-Z, but they do not determine the info experimentally. They get the info by querying the chip and BIOS.