7.12.2. Nonblocking Broadcast

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MPI_IBCAST(buffer, count, datatype, root, comm, request)
INOUT bufferstarting address of buffer (choice)
IN countnumber of entries in buffer (non-negative integer)
IN datatypedatatype of buffer (handle)
IN rootrank of broadcast root (integer)
IN commcommunicator (handle)
OUT requestcommunication request (handle)
C binding
int MPI_Ibcast(void *buffer, int count, MPI_Datatype datatype, int root, MPI_Comm comm, MPI_Request *request)
int MPI_Ibcast_c(void *buffer, MPI_Count count, MPI_Datatype datatype, int root, MPI_Comm comm, MPI_Request *request)
Fortran 2008 binding
MPI_Ibcast(buffer, count, datatype, root, comm, request, ierror)

TYPE(*), DIMENSION(..), ASYNCHRONOUS :: buffer
INTEGER, INTENT(IN) :: count, root
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
MPI_Ibcast(buffer, count, datatype, root, comm, request, ierror) !(_c)

TYPE(*), DIMENSION(..), ASYNCHRONOUS :: buffer
INTEGER(KIND=MPI_COUNT_KIND), INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
INTEGER, INTENT(IN) :: root
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
Fortran binding
MPI_IBCAST(BUFFER, COUNT, DATATYPE, ROOT, COMM, REQUEST, IERROR)

<type> BUFFER(*)
INTEGER COUNT, DATATYPE, ROOT, COMM, REQUEST, IERROR

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

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7.12.2.1. Example using MPI_IBCAST

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The example in this section uses an intra-communicator.


Example Start a broadcast of 100 ints from MPI process 0 to every MPI process in the group, perform some computation on independent data, and then complete the outstanding broadcast operation.

Image file

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