NAME

       MPI_Init -  Initialize the MPI execution environment

SYNOPSIS

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

INPUT/OUTPUT PARAMETERS

       argc   - argc (None)
       argv   - argv (None)

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.

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 FOR C

       As of MPI-2, MPI_Init will accept NULL as input parameters. Doing so will impact  the  values  stored  in
       MPI_INFO_ENV .

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 guarantee 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
              - Other error; use MPI_Error_string to get more information about this error code.

SEE ALSO

       MPI_Init_thread, MPI_Finalize

                                                    2/9/2024                                         MPI_Init(3)