MPI_Comm_create(3)                    MPI                   MPI_Comm_create(3)



NAME
       MPI_Comm_create -  Creates a new communicator

SYNOPSIS
       #include "mpi.h"
       int MPI_Comm_create ( MPI_Comm comm, MPI_Group group, MPI_Comm *comm_out )

INPUT PARAMETERS
       comm   - communicator (handle)
       group  - group, which is a subset of the group of comm (handle)


OUTPUT PARAMETER
       comm_out
              - new communicator (handle)


NOTES FOR FORTRAN
       All  MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have
       an additional argument ierr at the end of the argument list.   ierr  is
       an  integer and has the same meaning as the return value of the routine
       in C.  In Fortran, MPI routines are subroutines, and are  invoked  with
       the call statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
       Fortran.


ERRORS
       All MPI routines (except MPI_Wtime and  MPI_Wtick  )  return  an  error
       value;  C routines as the value of the function and Fortran routines in
       the last argument.  Before the value is returned, the current MPI error
       handler  is called.  By default, this error handler aborts the MPI job.
       The error handler may be changed with MPI_Errhandler_set ;  the  prede-
       fined error handler MPI_ERRORS_RETURN may be used to cause error values
       to be returned.  Note that MPI does not guarentee that an  MPI  program
       can continue past an error.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_COMM
              -  Invalid communicator.  A common error is to use a null commu-
              nicator in a call (not even allowed in MPI_Comm_rank ).
       MPI_ERR_GROUP
              - Null group passed to function.
       MPI_ERR_INTERN
              - This error is returned when some part of the MPICH implementa-
              tion is unable to acquire memory.


SEE ALSO
       MPI_Comm_free

LOCATION
       comm_create.c



                                  11/14/2001                MPI_Comm_create(3)