NAME

       MPI_Init -  Initialize the MPI execution environment

SYNOPSIS

       #ifdef ENABLE_QMPI
       #ifndef MPICH_MPI_FROM_PMPI
       int QMPI_Init(QMPI_Context context, int tool_id, int *argc, char ***argv) MPICH_API_PUBLIC

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

                                                    1/21/2022                                        MPI_Init(3)