Disable UCP_FEATURE_WAKEUP in non-blocking mode

[pentschev]

This is currently the only way to enable shared memory support.

See openucx/ucx#5322 for the discussion about it.

[quasiben]

Looks good. Currently failing on flake8:

./ucp/core.py:240:89: E501 line too long (106 > 88 characters)

Do you think it's worth exposing ucp_params to the Python layer. Not to set but only for getting. This would allow us to test and others to confirm UCP configurations.

[pentschev]

Thanks for pinging @quasiben , I hadn't seen the error before, should be fixed now.

Do you think it's worth exposing ucp_params to the Python layer. Not to set but only for getting. This would allow us to test and others to confirm UCP configurations.

I don't know, maybe? TBH, I'm ignorant of that, is that information useful at runtime somehow? Also note that UCXWorker too has a similar worker_params that aren't exposed. Maybe it would make more sense to open an issue to discuss if it's useful/worth to expose those?

[pentschev]

Failures are legit, I'm trying to find out whether disabling UCP_FEATURE_WAKEUP is indeed supposed to work in all cases or if there are any limitations, which seems to be the case.

[pentschev]

Ok, this is an issue in UCX 1.8.x but as per my local tests it works in 1.9.x, so we'll need to wait for that to merge this PR.