Persistent All-Reduce

7.13.8. Persistent All-Reduce

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MPI_ALLREDUCE_INIT(sendbuf, recvbuf, count, datatype, op, comm, info, request)
IN sendbuf	starting address of send buffer (choice)
OUT recvbuf	starting address of receive buffer (choice)
IN count	number of elements in send buffer (non-negative integer)
IN datatype	datatype of elements of send buffer (handle)
IN op	operation (handle)
IN comm	communicator (handle)
IN info	info argument (handle)
OUT request	communication request (handle)

C binding
int MPI_Allreduce_init(const void *sendbuf, void *recvbuf, int count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Info info, MPI_Request *request) int MPI_Allreduce_init_c(const void *sendbuf, void *recvbuf, MPI_Count count, MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Info info, MPI_Request *request) Fortran 2008 binding
MPI_Allreduce_init(sendbuf, recvbuf, count, datatype, op, comm, info, request, ierror) TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: sendbuf TYPE(*), DIMENSION(..), ASYNCHRONOUS :: recvbuf INTEGER, INTENT(IN) :: count 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_Allreduce_init(sendbuf, recvbuf, count, datatype, op, 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 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_ALLREDUCE_INIT(SENDBUF, RECVBUF, COUNT, DATATYPE, OP, COMM, INFO, REQUEST, IERROR) <type> SENDBUF(*), RECVBUF(*) INTEGER COUNT, DATATYPE, OP, COMM, INFO, REQUEST, IERROR

Creates a persistent collective communication request for the allreduce operation.

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