NAME

       MPI_Comm_set_info - Set communicator info hints

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Comm_set_info(MPI_Comm comm, MPI_Info info)

Fortran Syntax

       USE MPI
       ! or the older form: INCLUDE 'mpif.h'
       MPI_COMM_SET_INFO(COMM, INFO, IERROR)
            INTEGER   COMM, INFO, IERROR

Fortran 2008 Syntax

       USE mpi_f08
       MPI_Comm_set_info(comm, info, ierror)
            TYPE(MPI_Comm), INTENT(IN) :: comm
            TYPE(MPI_Info), INTENT(IN) :: info
            INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETERS

       comm      Communicator on which to set info hints

       info      Info object containing hints to be set on comm

OUTPUT PARAMETERS

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_COMM_SET_INFO  sets new values for the hints of the communicator associated with comm.
       MPI_COMM_SET_INFO is a collective routine. The  info  object  may  be  different  on  each
       process,  but  any  info  entries  that  an  implementation requires to be the same on all
       processes must appear with the same value in each process's info object.

       The following info key assertions may be accepted by Open MPI:

       mpi_assert_no_any_tag (boolean): If set to true, then the implementation may  assume  that
       the process will not use the MPI_ANY_TAG wildcard on the given communicator.

       mpi_assert_no_any_source  (boolean):  If  set  to true, then the implementation may assume
       that the process will not use the MPI_ANY_SOURCE wildcard on the given communicator.

       mpi_assert_exact_length (boolean): If set to true, then the implementation may assume that
       the  lengths  of  messages  received  by  the  process  are  equal  to  the lengths of the
       corresponding receive buffers, for point-to-point communication operations  on  the  given
       communicator.

       mpi_assert_allow_overtaking  (boolean): If set to true, then the implementation may assume
       that point-to-point communications on the given communicator  do  not  rely  on  the  non-
       overtaking  rule specified in MPI-3.1 Section 3.5. In other words, the application asserts
       that send operations are not required to be matched at the receiver in the order in  which
       the  send operations were performed by the sender, and receive operations are not required
       to be matched in the order in which they were performed by the receiver.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and
       Fortran routines in the last argument.

       Before  the  error value is returned, the current MPI error handler is called. By default,
       this error handler aborts the MPI job, except for I/O function errors. The  error  handler
       may    be   changed   with   MPI_Comm_set_errhandler;   the   predefined   error   handler
       MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not
       guarantee that an MPI program can continue past an error.

SEE ALSO

       MPI_Comm_get_info, MPI_Info_create, MPI_Info_set, MPI_Info_free