Add MPI communicator option to the MUMPS solver interface #790
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This PR adds an MPI communicator option to the MUMPS solver interface. The motivation for this came from wanting to use MUMPS with
MPI_COMM_SELF.The project that I'm working on, internal to LLNL, runs in parallel, but runs MUMPS serially. In order to achieve this, we configure MUMPS with MPI, but set
--disable-mpiinitas described here under "MUMPS Linear Solver".We use Spack to install our third party libraries, including Ipopt and MUMPS. This means we are not using the recommended ThirdParty-Mumps. Figured I would share for awareness (our package.py is slightly different): https://github.com/spack/spack/blob/develop/var/spack/repos/builtin/packages/ipopt/package.py.
Before the changes in this PR, our tests were hanging when run with multiple MPI tasks.