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Opened Mar 17, 2020 by snuverink_j@snuverink_j
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Replace MPI_Allreduce with allreduce

@frey_m suggested in #485 (comment 18514) to use allreduce instead of MPI_Allreduce:

Please consider also the use of Datatypes.h with one of the allreduce functions.

[..] Here is an example.

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OPAL 2.4.0
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OPAL 2.4.0
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Reference: OPAL/src#486