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Improve VTK-m cuda scheduling based on Summit scaling study

Robert Maynard requested to merge robertmaynard/vtk-m:better_3dschedule_for_summit into master

When benchmarking the VTK-m algorithms on Summit I discovered that our scheduling choices aren't optimal for the hardware.

This is a short term fix where we select good numbers for Summit, and in the future make the defaults controllable by the calling programming and/or environment variables.

Performance numbers can be found at: https://gitlab.kitware.com/snippets/755

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