RPN_COMM

(RPN_COMM_allreduce)

 
SUBROUTINE RPN_COMM_allreduce( sendbuf, recvbuf, count, datatype, op, comm, ierr )

ARGUMENTS

datatype:  character (see table below)
op:        character (see table below)
comm:      character (see table below)

See the MPI documentation for MPI_Allreduce

DESCRIPTION

Stub for MPI_allreduce routine using the same calling sequence, except for datatypes, operators and communicators. Those are replaced by an equivalent string, described in the table below:
 
Types supported Operators supported Communicators recognized
"MPI_CHARACTER"* "MPI_OP_NULL" "EW"  (east-west)
"MPI_INTEGER" "MPI_MAX" "NS"  (north-south)
"MPI_INTEGER2" "MPI_MIN" "GRID" (full domain grid)
"MPI_REAL" "MPI_SUM" "BLOC" (inside local block)
"MPI_REAL8" "MPI_PROD" "BLOCMASTER" (between blocks master PEs)
"MPI_REAL4" "MPI_LAND" "ALL" (every PE)
"MPI_DOUBLE_PRECISION" "MPI_BAND" "DOMM", equivalent to "GRID"
"MPI_COMPLEX" "MPI_LOR" "DEFO" default communicator
"MPI_DOUBLE_COMPLEX" "MPI_BOR"
"MPI_LOGICAL" "MPI_LXOR"
"MPI_BXOR"
"MPI_MAXLOC"
"MPI_MINLOC"
* Note: MPI_CHARACTER for/pour RPN_COMM_bcastc only/seulement


 

EXAMPLE

1- MPI_allreduce for north-south strip, we want a summation:

call RPN_COMM_allreduce(mydata, result, nitems_in_mydata, "mpi_integer" ,"mpi_sum","NS", ierr)

SEE ALSO

RPN_COMM_* 

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