Comment by mlyle

Again, there's already explicit ways for programs to show fine control; this stuff is already declared in ACPI and libnuma and higher level shims exist over it. But generally you want to know both how the entire machine is being used and pretty detailed information about working set sizes before attempting this.

Most things that have tried to set affinities have ended up screwing it up.

There's no need to put an easier user interface on the footgun or to make the footgun cross-platform. These interfaces provide opportunities for small wins (generally <5%) and big losses. If you're in a supercomputing center or a hyperscaler running your own app, this is worth it; if you're writing a DBMS that will run on tens of thousands of dedicated machines, it may be worth it. But usually you don't understand the way you'll be employed well enough to know if this is a win.