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

4.1.6                                             Sep 30, 2023                              MPI_Comm_set_info(3)