[core] Does Ray support NUMA?

[Jay-ju]

Description

When I set num_cpus, can I bind this num_cpus to a certain cpu? If not currently possible, I will try to do it here.

Use case

No response

[MortalHappiness]

I think you can to use custom resources.

[Jay-ju]

I think you can to use custom resources.

Can custom resources achieve that when I set num_cpus=0.5 for a certain actor, the executing thread always falls on a certain CPU? And it will not switch CPUs. The main purpose is to reduce the time for CPU core switching.

[Superskyyy]

I think you can to use custom resources.

Can custom resources achieve that when I set num_cpus=0.5 for a certain actor, the executing thread always falls on a certain CPU? And it will not switch CPUs. The main purpose is to reduce the time for CPU core switching.

You can simply achieve the pinned CPU behavior with the Python api os.sched_setaffinity and no setting cpu in Ray alone is purely logical not only it doesn't pin the process to CPU, it also doesn't restrict using more than 0.5 CPUs, it can use 100 potentially.