CPU Binding on OS X

[daschl]

Hey folks,

1.11 does not support cpu binding on os x, but it looks like os x added support for it fairly recently: https://developer.apple.com/library/mac/releasenotes/Performance/RN-AffinityAPI/#//apple_ref/doc/uid/TP40006635-CH1-DontLinkElementID_2

$ hwloc-bind core:1
hwloc_set_cpubind 0x0000000c failed (errno 78 Function not implemented)

Is this something that could be added to hwloc?

[bgoglin]

Not sure I am reading this properly, but my understanding is that this won't let you bind tasks to specific cores, but rather just let you say whether some tasks should remain close or far away from each other (share the same L2 or not).

Also, this affinity seems to be destroyed at exec(), which would make hwloc-bind useless.

[daschl]

@bgoglin ah, that makes sense - thanks for the clarification!

Btw, I'm working on a rust binding :) https://github.com/daschl/hwloc-rs

[bgoglin]

Thanks ! Let us know if you need help for this binding and/or testing.

[daschl]

@bgoglin yes will do! I'll ping you once its more or less complete - right now discovery pretty much works but I need to add nearly complete cpu and mem binding.