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AMReXParticlesReader: handle inexact division of grids among MPI ranks

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:fix-parallel-amrex-particle-reader into master
  • this commit fixes the grid-process assignment logic when the number of grids cannot be exactly divided among the number of MPI ranks (pieces in a vtkMultiPieceDataSet in this code)
  • this commit also adds MPI awareness to an existing unit test.
  • the unit test TestAMReXParticlesReader is run with MPI, when enabled, on 3 nodes. It passes only when the sum of the number of points across all nodes is equal to a known value.
  • without the change in vtkAMReXParticlesReader, the unit test will faill with MPI

Cc: @patrick-oleary @cory.quammen

Edited by Jaswant Panchumarti (Kitware)

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