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p-costa / SNaC

A multi-block solver for massively parallel direct numerical simulations (DNS) of fluid flows

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leverage upcoming large counts support to avoid integer overflow in `MPI_Alltoallw`

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This is a known issue of the MPI Standard, which has been fixed in the recent 4.0 Standard. When supported by the implementations, the send and recv count arrays should be of kindMPI_COUNT_KIND, and the corresponding and recv displacements of kind MPI_ADDRESS_KIND.