Conda provided OpenMC does not have MPI enabled

[msavtchouk-pf]

Following the installation guide:
https://docs.openmc.org/en/latest/quickinstall.html#installing-on-linux-mac-with-mamba-and-conda-forge
and package documentations:

https://anaconda.org/conda-forge/openmc
... Parallelism is enabled via a hybrid MPI and OpenMP programming model.
However, looking at the acquired library, I don't see any dependency on libmpi or similar.
This seems to be confirmed by practical experiments running in parallel with mpiexec
https://docs.openmc.org/en/latest/usersguide/parallel.html#distributed-memory-parallelism-mpi
Logs don't provide any insights either (i.e. are we running in parallel or not), unfortunately

[paulromano]

The openmc package on conda-forge does have MPI "variants" where MPI support is enabled. To install one of these versions, run the following:

• Built against MPICH: conda install "openmc=*=*mpi_mpich*"
• Built against OpenMPI: conda install "openmc=*=*mpi_openmpi*"