7.12.10. Nonblocking Reduce-Scatter

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MPI_IREDUCE_SCATTER(sendbuf, recvbuf, recvcounts, datatype, op, comm, request)
IN sendbufstarting address of send buffer (choice)
OUT recvbufstarting address of receive buffer (choice)
IN recvcountsnonnegative integer array specifying the number of elements in result distributed to each MPI process.
IN datatypedatatype of elements of input buffer (handle)
IN opoperation (handle)
IN commcommunicator (handle)
OUT requestcommunication request (handle)
C binding
int MPI_Ireduce_scatter(const void *sendbuf, void *recvbuf, const int recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Request *request)
int MPI_Ireduce_scatter_c(const void *sendbuf, void *recvbuf, const MPI_Count recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Request *request)
Fortran 2008 binding
MPI_Ireduce_scatter(sendbuf, recvbuf, recvcounts, datatype, op, comm, request, ierror)
TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: sendbuf
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: recvbuf
INTEGER, INTENT(IN), ASYNCHRONOUS :: recvcounts(*)
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Op), INTENT(IN) :: op
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
MPI_Ireduce_scatter(sendbuf, recvbuf, recvcounts, datatype, op, comm, request, ierror) !(_c)
TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: sendbuf
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: recvbuf
INTEGER(KIND=MPI_COUNT_KIND), INTENT(IN), ASYNCHRONOUS :: recvcounts(*)
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Op), INTENT(IN) :: op
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
Fortran binding
MPI_IREDUCE_SCATTER(SENDBUF, RECVBUF, RECVCOUNTS, DATATYPE, OP, COMM, REQUEST, IERROR)
<type> SENDBUF(*), RECVBUF(*)
INTEGER RECVCOUNTS(*), DATATYPE, OP, COMM, REQUEST, IERROR

This call starts a nonblocking variant of MPI_REDUCE_SCATTER (see Section MPI_REDUCE_SCATTER). The array argument must be identical on all calling MPI processes.

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