Explainer: L1 vs. L2 vs. L3 Cache

guest · Aug 10, 2020

Explainer: L1 vs. L2 vs. L3 Cache
Cache: a multi-level parking lot
August 10, 2020
https://www.techspot.com/article/2066-cpu-l1-l2-l3-cache/

Every single CPU found in any computer, from a cheap laptop to a million-dollar server, will have something called cache. More likely than not, it'll possess several levels of it, too.

It must be important, otherwise why would it be there? But what does cache do, and why the need of different levels of the stuff? What on Earth does 12-way set associative even mean?
What exactly is cache?
TL;DR: It's small, but very fast memory that sits right next to the CPU's logic units.
But of course, there's much more we can learn about cache...
Click to expand...

[...]
Cache, in a nutshell: absolutely needed, absolutely awesome pieces of technology. We've not looked at other caches types in CPUs and GPUs (such as translation lookup buffers or texture caches), but since they all follow a simple structure and pattern of levels as we've covered here, they perhaps won't sound so complicated.
Click to expand...

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