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DArray: DaggerMPI for MPI support #407

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Commits on Jul 20, 2023

  1. Add DaggerMPI subpackage for MPI integrations

    Allows the `DArray` to participate in MPI operations, by building on the
    newly-added support for "MPI-style" partitioning (i.e. only the
    rank-local partition is stored), via a new `MPIBlocks` partitioner. This
    commit also implements MPI-powered `distribute` and `reduce` operations
    for `MPIBlocks`-partitioned arrays, which support a variety of
    distribution schemes and data transfer modes.
    jpsamaroo committed Jul 20, 2023
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