Persistent Reduce-Scatter

7.13.10. Persistent Reduce-Scatter

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MPI_REDUCE_SCATTER_INIT(sendbuf, recvbuf, recvcounts, datatype, op, comm, info, request)
IN sendbuf	starting address of send buffer (choice)
OUT recvbuf	starting address of receive buffer (choice)
IN recvcounts	nonnegative integer array specifying the number of elements in result distributed to each MPI process. This array must be identical on all calling MPI processes.
IN datatype	datatype of elements of input buffer (handle)
IN op	operation (handle)
IN comm	communicator (handle)
IN info	info argument (handle)
OUT request	communication request (handle)

C binding
int MPI_Reduce_scatter_init(const void *sendbuf, void *recvbuf, const int recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Info info, MPI_Request *request) int MPI_Reduce_scatter_init_c(const void *sendbuf, void *recvbuf, const MPI_Count recvcounts[], MPI_Datatype datatype, MPI_Op op, MPI_Comm comm, MPI_Info info, MPI_Request *request) Fortran 2008 binding
MPI_Reduce_scatter_init(sendbuf, recvbuf, recvcounts, datatype, op, comm, info, 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_Info), INTENT(IN) :: info TYPE(MPI_Request), INTENT(OUT) :: request INTEGER, OPTIONAL, INTENT(OUT) :: ierror MPI_Reduce_scatter_init(sendbuf, recvbuf, recvcounts, datatype, op, comm, info, 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_Info), INTENT(IN) :: info TYPE(MPI_Request), INTENT(OUT) :: request INTEGER, OPTIONAL, INTENT(OUT) :: ierror Fortran binding
MPI_REDUCE_SCATTER_INIT(SENDBUF, RECVBUF, RECVCOUNTS, DATATYPE, OP, COMM, INFO, REQUEST, IERROR) <type> SENDBUF(*), RECVBUF(*) INTEGER RECVCOUNTS(*), DATATYPE, OP, COMM, INFO, REQUEST, IERROR

Creates a persistent collective communication request for the reduce-scatter operation.

Up: Persistent Collective Operations Next: Persistent Inclusive Scan Previous: Persistent Reduce-Scatter with Equal Blocks

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(Unofficial) MPI-4.1 of November 2, 2023
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