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You are correct. The current HPC-X does not build with thread support.
However, HPC-X does come with the source and instructions to build, so it can be compiled with the thread support separately if the application does require to use thread support from the HPC-X MPI library.
I hadn't done my homework. I thought the tar ball in HPC-X was the regular OpenMPI only, but now that I looked I realize that the yalla driver is included.
Thanks for pointing it out.