The registration cache seems like the safest,


+100
I'm absolutely agree here, it is full solution that totally resolve the issue for HW that we have now.

but the notifier would be better than where we are today if we can get the important race conditions out of it.


+0.1. Yes, it would work, and I agree that it would be marginally better than what we have today. IMHO, it seems like fixing this Right would be better than "let's do a possibly simpler but sub-optimal solution."
Sound like solution that may to work, but definitely we introduce here much more complexity that we have now(to all mpi implementation!)....and I guess the idea was make it functional and simple.

Pasha
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