7.13.7. Persistent Reduce

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MPI_REDUCE_INIT(sendbuf, recvbuf, count, datatype, op, root, comm, info, request)
IN sendbufaddress of send buffer (choice)
OUT recvbufaddress of receive buffer (choice, significant only at root)
IN countnumber of elements in send buffer (non-negative integer)
IN datatypedatatype of elements of send buffer (handle)
IN opreduce operation (handle)
IN rootrank of the root (integer)
IN commcommunicator (handle)
IN infoinfo argument (handle)
OUT requestcommunication request (handle)
C binding
int MPI_Reduce_init(const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm, MPI_Info info, MPI_Request *request)
int MPI_Reduce_init_c(const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op, int root, MPI_Comm comm, MPI_Info info, MPI_Request *request)
Fortran 2008 binding
MPI_Reduce_init(sendbuf, recvbuf, count, datatype, op, root, comm, info, request, ierror)

TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: sendbuf
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: recvbuf
INTEGER, INTENT(IN) :: count, root
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Op), INTENT(IN) :: op
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Info), INTENT(IN) :: info
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
MPI_Reduce_init(sendbuf, recvbuf, count, datatype, op, root, comm, info, request, ierror) !(_c)

TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: sendbuf
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: recvbuf
INTEGER(KIND=MPI_COUNT_KIND), INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Op), INTENT(IN) :: op
INTEGER, INTENT(IN) :: root
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Info), INTENT(IN) :: info
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
Fortran binding
MPI_REDUCE_INIT(SENDBUF, RECVBUF, COUNT, DATATYPE, OP, ROOT, COMM, INFO, REQUEST, IERROR)

<type> SENDBUF(*), RECVBUF(*)
INTEGER COUNT, DATATYPE, OP, ROOT, COMM, INFO, REQUEST, IERROR

Creates a persistent collective communication request for the reduce operation.

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