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MPI_Get_address(3OpenMPI)                                                          MPI_Get_address(3OpenMPI)



NAME
       MPI_Get_address - Gets the address of a location in memory.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Get_address(void *location, MPI_Aint *address)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_GET_ADDRESS(LOCATION, ADDRESS, IERROR)
            <type> LOCATION(*)
            INTEGER   ADDRESS, IERROR


C++ Syntax
       #include <mpi.h>
       MPI::Aint MPI::Get_address(void* location)


INPUT PARAMETERS
       location  Location in caller memory (choice).


OUTPUT PARAMETERS
       address   Address of location (integer).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_Get_address returns the byte address of a location in memory.

       Example: Using MPI_Get_address for an array.

       EAL A(100,100)
          INTEGER I1, I2, DIFF
          CALL MPI_GET_ADDRESS(A(1,1), I1, IERROR)
          CALL MPI_GET_ADDRESS(A(10,10), I2, IERROR)
          DIFF = I2 - I1
       ! The value of DIFF is 909*sizeofreal; the values of I1 and I2 are
       ! implementation dependent.


NOTES
       Current  Fortran MPI codes will run unmodified and will port to any system. However, they may fail if
       addresses larger than 2^32 - 1 are used in the program. New codes should be written so that they  use
       the  new functions. This provides compatibility with C/C++ and avoids errors on 64-bit architectures.
       However, such newly written codes may need to be (slightly) rewritten to port to old Fortran 77 envi-ronments environments
       ronments that do not support KIND declarations.


ERRORS
       Almost  all  MPI  routines return an error value; C routines as the value of the function and Fortran
       routines in the last argument. C++ functions do not return errors. If the default  error  handler  is
       set  to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw
       an MPI:Exception object.

       Before the error value is returned, the current MPI error handler is called. By default,  this  error
       handler  aborts  the  MPI  job, except for I/O function errors. The error handler may be changed with
       MPI_Comm_set_errhandler; 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.




Open MPI 1.2                                   September 2006                      MPI_Get_address(3OpenMPI)