Removing another API that need not be on MultiBlock. There's generally
no need for apps to know this. If needed, we can add `...Compute`
function. This removes another API on MultiBlock that could trigger
parallel communication/synchronization.
Removing MultiBlock::GetGlobalRange API to keep things consistent with
DataSet API. Instead, one should use `FieldRangeCompute` or
`FieldRangeGlobalCompute` as appropriate.
This fixes several issues with how DIY was used in MultiBlock.
Instead of using `diy::RegularSwapPartners` using
`diy::RegularMergePartners` to reduce data to block(gid=0) and then
broadcast out to all ranks (and not blocks) using
`diy::RegularBroadcastPartners`. Old code that used RegularSwapPartners
ended up building reduced result on all blocks, which was not only
unnecessary, but expensive since we would generally have more blocks
than ranks.
Remove `DecomposerMultiBlock`. This class was needed due to my
misunderstanding of how the decomposer works.
`diy::RegularDecomposer<diy::DiscreteBounds>` provides all the necessary
functionality provided by `DecomposerMultiBlock`.
Several MultiBlock methods take references as arguments. Generally that
is good as some of the arguments take larger data structures like
DataSet and std::vector that can be passed much faster as a reference.
However, the references were not declared const, which means that you
could not use rvalues. This is now fixed.
DIY now depends on MPI optionally. Hence we no longer need to depend on
DIY optionally based on whether MPI was enabled. Update cmake and c++
code to always use DIY-based components.
DIY is built with MPI support if VTKm_ENABLE_MPI is ON.
MultiBlock now uses `diy::reduce` for reductions rather than using proxy
collectives. To support using `diy::reduce` operations on a
vtkm::cont::MultiBlock, added AssignerMultiBlock and
DecomposerMultiBlock classes. This are helper classes that provide DIY
concepts on top of a existing MultiBlock.
Updating MultiBlock to use `diy` for computing block summaries like
ranges, bounds etc. This makes it possible to MultiBlock to
work in distributed operations without explicit logic.
Sandia National Laboratories recently changed management from the
Sandia Corporation to the National Technology & Engineering Solutions
of Sandia, LLC (NTESS). The copyright statements need to be updated
accordingly.
