mpi_init(3) [debian man page]

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

       init.c

								     1/12/2011							       MPI_Init(3)

MPI_Init_thread(3)                                                      MPI                                                     MPI_Init_thread(3)

NAME

       MPI_Init_thread -  Initialize the MPI execution environment

SYNOPSIS

       int MPI_Init_thread( int *argc, char ***argv, int required, int *provided )

INPUT PARAMETERS

       argc   - Pointer to the number of arguments
       argv   - Pointer to the argument vector
       required
              - Level of desired thread support

OUTPUT PARAMETER

       provided
              - Level of provided thread support

COMMAND LINE ARGUMENTS

       MPI  specifies  no  command-line arguments but does allow an MPI implementation to make use of them.  See MPI_INIT for a description of the
       command line arguments supported by MPI_INIT and MPI_INIT_THREAD .

NOTES

       The valid values for the level of thread support are:
       MPI_THREAD_SINGLE
              - Only one thread will execute.
       MPI_THREAD_FUNNELED
              - The process may be multi-threaded, but only the main thread will make MPI calls (all MPI calls are funneled to the main thread).
       MPI_THREAD_SERIALIZED
              - The process may be multi-threaded, and multiple threads may make MPI calls, but only one at a time: MPI calls are not made concur-
              rently from two distinct threads (all MPI calls are serialized).
       MPI_THREAD_MULTIPLE
              - Multiple threads may call MPI, with no restrictions.

NOTES FOR FORTRAN

       Note that the Fortran binding for this routine does not have the argc and argv arguments. ( MPI_INIT_THREAD(required, provided, ierror) )

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

SEE ALSO

       MPI_Init, MPI_Finalize

LOCATION

       initthread.c

                                                                     6/18/2011                                                  MPI_Init_thread(3)