Global average

For distributed data, averaging communication.

• For example, average over whole grid.
  • Which parts of the calculation are parallel?
    • Message passing:
      • Partial sums of local data only

      • Send partial sums to every other PE

      • Add up local copies of partial sums to get local copy of global sum.

    • Data parallel:
      • Similar; efficiency is implementation-dependent
        • HPF (F90) SUM intrinsic

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