17.2.167. MPI_Get_address
MPI_Get_address - Gets the address of a location in memory.
17.2.167.1. Syntax
17.2.167.1.1. C Syntax
#include <mpi.h>
int MPI_Get_address(const void *location, MPI_Aint *address)
17.2.167.1.2. Fortran Syntax
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_GET_ADDRESS(LOCATION, ADDRESS, IERROR)
<type> LOCATION(*)
INTEGER(KIND=MPI_ADDRESS_KIND) ADDRESS
INTEGER IERROR
17.2.167.1.3. Fortran 2008 Syntax
USE mpi_f08
MPI_Get_address(location, address, ierror)
TYPE(*), DIMENSION(..), ASYNCHRONOUS :: location
INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: address
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
17.2.167.2. Input Parameters
location
: Location in caller memory (choice).
17.2.167.3. Output Parameters
address
: Address of location (integer).IERROR
: Fortran only: Error status (integer).
17.2.167.4. 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.
17.2.167.5. 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 and avoids errors on
64-bit architectures. However, such newly written codes may need to be
(slightly) rewritten to port to old Fortran 77 environments that do not
support KIND declarations.
17.2.167.6. Errors
Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument.
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.