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I use the function as it is used in many other places within OpenIFS. Does it work only for 1-d variables and returns in the input variable? Did I misunderstand something here?
edit: I found this gem in diwrgrid_mod.F90 
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! Should really make a version of MPL_GATHERV accepting 2D fields
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I guess that confirms it. I ended up using MPL_MPIF and the regular MPI_ALLREDUCEI'll be using normal MPI_ALLREDUCE for now but I'd still like to learn.
Cheers,
Jan