7.12.9. Nonblocking Reduce-Scatter with Equal Blocks

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MPI_IREDUCE_SCATTER_BLOCK(sendbuf, recvbuf, recvcount, datatype, op, comm, request)
IN sendbufstarting address of send buffer (choice)
OUT recvbufstarting address of receive buffer (choice)
IN recvcountelement count per block (non-negative integer)
IN datatypedatatype of elements of send and receive buffers (handle)
IN opoperation (handle)
IN commcommunicator (handle)
OUT requestcommunication request (handle)
C binding
int MPI_Ireduce_scatter_block(const void *sendbuf, void *recvbuf, int recvcount, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Request *request)
int MPI_Ireduce_scatter_block_c(const void *sendbuf, void *recvbuf, MPI_Count recvcount, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Request *request)
Fortran 2008 binding
MPI_Ireduce_scatter_block(sendbuf, recvbuf, recvcount, datatype, op, comm, request, ierror)

TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: sendbuf
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: recvbuf
INTEGER, INTENT(IN) :: recvcount
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_block(sendbuf, recvbuf, recvcount, datatype, op, comm, request, ierror) !(_c)

TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: sendbuf
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: recvbuf
INTEGER(KIND=MPI_COUNT_KIND), INTENT(IN) :: recvcount
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_BLOCK(SENDBUF, RECVBUF, RECVCOUNT, DATATYPE, OP, COMM, REQUEST, IERROR)

<type> SENDBUF(*), RECVBUF(*)
INTEGER RECVCOUNT, DATATYPE, OP, COMM, REQUEST, IERROR

This call starts a nonblocking variant of MPI_REDUCE_SCATTER_BLOCK (see Section MPI_REDUCE_SCATTER_BLOCK).

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