NAME

       MPI_Comm_dup_with_info  -  Duplicates an existing communicator using provided info.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Comm_dup_with_info(MPI_Comm comm, MPI_Info info, MPI_Comm *newcomm)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_COMM_DUP_WITH_INFO(COMM, INFO, NEWCOMM, IERROR)
            INTEGER   COMM, INFO, NEWCOMM, IERROR

INPUT PARAMETER

       comm      Communicator (handle).

       info      Info argument (handle).

OUTPUT PARAMETERS

       newcomm   Copy of comm (handle).

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       MPI_Comm_dup_with_info  acts  exactly  like  MPI_Comm_dup  except that the info hints associated with the
       communicator comm are not duplicated in newcomm. The hints provided by the argument info  are  associated
       with the output communicator newcomm instead.

NOTES

       This  operation  is used to provide a parallel library call with a duplicate communication space that has
       the same properties as the original communicator. This includes any attributes (see below) and topologies
       (see  Chapter  6,  "Process  Topologies,"  in  the  MPI-1 Standard). This call is valid even if there are
       pending point-to-point communications involving the communicator comm. A typical call  might  involve  an
       MPI_Comm_dup_with_info  at  the  beginning  of the parallel call, and an MPI_Comm_free of that duplicated
       communicator at the end of the call. Other models of communicator management are also possible.

       This call applies to both intra- and intercommunicators.

       Note that it is not defined by the MPI standard what happens if the attribute copy callback invokes other
       MPI  functions.   In Open MPI, it is not valid for attribute copy callbacks (or any of their children) to
       add or delete attributes on the same object on which the attribute copy callback is being invoked.

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_dup MPI_Comm_idup