MPI_Get_address(3) Open MPI MPI_Get_address(3)
NAME
MPI_Get_address - Gets the address of a location in memory.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Get_address(const void *location, MPI_Aint *address)
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
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
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 sys-
tem. 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 environments 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++ func-
tions 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.
4.1.2 Nov 24, 2021 MPI_Get_address(3)
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