- MPI_Gatherv requires contiguous data, but a byte-wise transfer can
quickly exceed the 'int' limits used for MPI sizes/offsets. Thus
gather label/scalar components when possible to increase the
effective size limit.
For non-contiguous types (or large contiguous data) now also
reverts to manual handling
ENH: handle contiguous data in GAMGAgglomeration gather values
- delegate to globalIndex::gatherValues static method (new)