Receive functions

MPI has a large number of functions for receiving data from a remote process. The following are the most basic receive functions:

Fortran subroutine: MPI_RECV (BUF, COUNT, DATATYPE, SOURCE, TAG, COMM, STATUS, IERROR)

<type> BUF(*)
INTEGER COUNT, DATATYPE, SOURCE, TAG, COMM
INTEGER STATUS(MPI_STATUS_SIZE), IERROR

C function: int MPI_Recv (void *buf, int count, MPI_Datatype datatype, int source, int tag, MPI_Comm comm, MPI_Status *status)

MPI_Recv() is a blocking point-to-point receive operation. The buf argument points to the initial address of the receive buffer. This buffer is big enough to contain at least count elements of type datatype. The call completes when a message arrives to the process with tag value tag, and which matches the rank specified by source relative to communicator group comm. The user can specify wildcard values for the source (MPI_ANY_SOURCE) and for the tag (MPI_ANY_TAG) fields. After the call completes, the user can examine the status variable to determine the size of the message received, the source of the message, and its tag (the latter two being useful if wildcard values were specified for the source or tag). For an example of MPI_Recv(), see section Basic MPI concepts.

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