Split mesh and mesh topology MPI communicators #2925
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…to garth/mesh-comms-split
Splitting could be made an option in the future.
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The change allows mesh input topology and geometry to be on a subset of the processes (MPI ranks) on which a
Meshis constructed.This allows for example, the mesh data to be partitioned using a subset of MPI ranks (this can be critical for performance at scale) or mesh data to be read from file on a subset of ranks and the mesh then built on a larger communicator.
Also, numerous documentation improvements.