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MPI_Init(3)                           MPI                          MPI_Init(3)


NAME

       MPI_Init -  Initialize the MPI execution environment


SYNOPSIS

       int MPI_Init( int *argc, char ***argv )


INPUT PARAMETERS

       argc   - Pointer to the number of arguments
       argv   - Pointer to the argument vector


THREAD AND SIGNAL SAFETY

       This routine must be called by one thread only.  That thread is called
       the main thread and must be the thread that calls MPI_Finalize .


NOTES

       The MPI standard does not say what a program can do before an MPI_INIT
       or after an MPI_FINALIZE .  In the MPICH implementation, you should do
       as little as possible.  In particular, avoid anything that changes the
       external state of the program, such as opening files, reading standard
       input or writing to standard output.


NOTES FOR FORTRAN

       The Fortran binding for MPI_Init has only the error return
       subroutine MPI_INIT( ierr )
       integer ierr


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_Comm_set_errhandler (for
       communicators), MPI_File_set_errhandler (for files), and
       MPI_Win_set_errhandler (for RMA windows).  The MPI-1 routine
       MPI_Errhandler_set may be used but its use is deprecated.  The
       predefined 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; however, MPI implementations will
       attempt to continue whenever possible.

       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_OTHER
              - This error class is associated with an error code that
              indicates that an attempt was made to call MPI_INIT a second
              time.  MPI_INIT may only be called once in a program.


SEE ALSO

       MPI_Init_thread, MPI_Finalize


LOCATION

       src/mpi/init/init.c

                                   1/11/2011                       MPI_Init(3)

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