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