Yup. That is the case for all composed datatype which is what the tuple types are. Predefined composed datatypes.
-Nathan On Aug 28, 2018, at 02:35 PM, "Jeff Squyres (jsquyres) via users" <users@lists.open-mpi.org> wrote: I think Gilles is right: remember that datatypes like MPI_2DOUBLE_PRECISION are actually 2 values. So if you want to send 1 pair of double precision values with MPI_2DOUBLE_PRECISION, then your count is actually 1. On Aug 22, 2018, at 8:02 AM, Gilles Gouaillardet <gilles.gouaillar...@gmail.com> wrote: Diego, Try calling allreduce with count=1 Cheers, Gilles On Wednesday, August 22, 2018, Diego Avesani <diego.aves...@gmail.com> wrote: Dear all, I am going to start again the discussion about MPI_MAXLOC. We had one a couple of week before with George, Ray, Nathan, Jeff S, Jeff S., Gus. This because I have a problem. I have two groups and two communicators. The first one takes care of compute the maximum vale and to which processor it belongs: nPart = 100 IF(MPI_COMM_NULL .NE. MPI_MASTER_COMM)THEN CALL MPI_ALLREDUCE( EFFMAX, EFFMAXW, 2, MPI_2DOUBLE_PRECISION, MPI_MAXLOC, MPI_MASTER_COMM,MPImaster%iErr ) whosend = INT(EFFMAXW(2)) gpeff = EFFMAXW(1) CALL MPI_BCAST(whosend,1,MPI_INTEGER,whosend,MPI_MASTER_COMM,MPImaster%iErr) ENDIF If I perform this, the program set to zero one variable, specifically nPart. if I print: IF(MPI_COMM_NULL .NE. MPI_MASTER_COMM)THEN WRITE(*,*) MPImaster%rank,nPart ELSE WRITE(*,*) MPIlocal%rank,nPart ENDIF I get; 1 2 1 2 3 2 3 2 2 2 2 2 1 2 1 2 3 2 3 2 2 2 2 2 1 0 1 0 0 0 0 0 This seems some typical memory allocation problem. What do you think? Thanks for any kind of help. Diego _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users -- Jeff Squyres jsquy...@cisco.com _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
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