debasishg.github.io/blog/part1-cache-conscious-data-layout-in-rust

wait no they don't

modern cpus use 128 byte cache lines

why 128 though

align everything to 128 bytes

so the 128 byte rule is just...

like a ping pong match

and the cache line bounces between cores

when two threads write to adjacent vars

oh god

but what about false sharing

makes sense

so they fit in one cache line

and padding the rest

right

so field zoning is like grouping hot fields together

ugh so annoying

boom two cache misses

so if your data crosses the line...

they fetch 64 bytes at a time

because cpu caches are dumb

but why though

yeah exactly

so like padding structs

basically aligning data to cache lines

wait what

128 byte rule?

false sharing is the worst

field zoning sounds fancy

okay but why rust

yo what's this cache thing about