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# Latency Numbers Every Programmer Should Know

There’s an indispensible file called Latency Numbers Every Programmer Should Know, originally by Jeff Dean of Google. I use a Roam Research plugin to do spaced repetition and memorize these numbers. But memorizing them is not good enough, I should also measure these numbers and see how close the values are in practice.

I created a Repl in Go to directly measure these numbers. I started with mutex lock/unlock. Locally, I get about 19ns, but the repl gives me between 12-14ns.

Try (or fork) the repl here