Wenduo Wang comments

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                                            Wenduo Wang

Singleton init mode, MPI_Comm_spawn, and OPAL_PREFIX

@dalcinl Thank you very much!

ompi/datatype: use size_t for count arguments

I also had the concern of breaking API compatibility but none of our CI(internal and gh action) actually caught this so that's interesting. I was reading the code and saw...

Up the submodule pointers for PMIx and PRRTE

Thanks for the PR. I'm running AWS CI.

Up the submodule pointers for PMIx and PRRTE

This PR failed AWS internal CI. Seeing a lot of failures ``` mpirun --wdir . -n 72 --hostfile hostfile --map-by ppr:36:node --timeout 1800 -x PATH mpi-benchmarks-IMB-v2021.7/IMB-MPI1 Scatterv -npmin 72 -iter...

Up the submodule pointers for PMIx and PRRTE

I'm running it again.

Up the submodule pointers for PMIx and PRRTE

I ran our tests again with many failures as shown above. I haven't got a chance to look into that yet. A quick glance shows `--enable-debug` fixes those failures.

Up the submodule pointers for PMIx and PRRTE

Finally I got some time to look into this. The issue happens on 2 nodes during MPI_Init ``` ... [ip-172-31-4-77.us-west-2.compute.internal:26954] mca: base: components_open: component tcp open function successful [ip-172-31-4-77.us-west-2.compute.internal:26954] select:...