Uploaded February 2025 | Updated September 2026, 3 weeks ago

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Relatively speedy-to-access cache saves your computer having to trudge over to the RAM, but with multiple levels of cache memory, how does it all work?

Matt Godbolt is known as the creator of Compiler Explorer, among other things! Find out more about him here: xania.org/MattGodbolt

Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: jane-st.co/computerphile

This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran's Numberphile. More at bradyharanblog.com