Persistent Reduce

7.13.7. Persistent Reduce

Up: Persistent Collective Operations Next: Persistent All-Reduce Previous: Persistent All-to-All Scatter/Gather

MPI_REDUCE_INIT(sendbuf, recvbuf, count, datatype, op, root, comm, info, request)
IN sendbuf	address of send buffer (choice)
OUT recvbuf	address of receive buffer (choice, significant only at root)
IN count	number of elements in send buffer (nonnegative integer)
IN datatype	datatype of elements of send buffer (handle)
IN op	reduce operation (handle)
IN root	rank of the root (integer)
IN comm	communicator (handle)
IN info	info argument (handle)
OUT request	communication 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 (see Section Reduce).

Up: Persistent Collective Operations Next: Persistent All-Reduce Previous: Persistent All-to-All Scatter/Gather

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