[OMPI users] UCX and MPI_THREAD_MULTIPLE

[Paul Edmon via users]

I have a code using MPI_THREAD_MULTIPLE along with MPI-RMA that I'm 
using OpenMPI 4.0.1.  Since 4.0.1 requires UCX I have it installed with 
MT on (1.6.0 build).  The thing is that the code keeps stalling out when 
I go above a couple of nodes.  UCX is new to our environment as 
previously we have just used the regular IB Verbs with no problem.  My 
guess is that there is either some option in OpenMPI I am missing or 
some variable in UCX I am not setting.  Any insight on what could be 
causing the stalls?

-Paul Edmon-
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