MFEM
How to communicate between different MPI_COMMs ? #3213
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prathamgit
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Specific to mfem, if we have a ParGridFunction object in many different comms, how do we transfer the data from one comm to another ? (comm is short for mpi communicator).
If every comm has the same number of processors assigned and the mesh is decomposed identically in every comm, I thought maybe we could take the vector data of the ParGridFunction (which has the data local to the processor/rank of the local comm) and do a point-to-point transfer between common ranks of the two comms ? But it’s not clear on how exactly to do this. Maybe there is something simpler ?
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