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MPI_Get_address - Gets the address of a location in memory.
#include <mpi.h>
int MPI_Get_address(const void *location, MPI_Aint *address)
INCLUDE ’mpif.h’
MPI_GET_ADDRESS(LOCATION, ADDRESS, IERROR)
<type> LOCATION(*)
INTEGER ADDRESS, IERROR
#include <mpi.h>
MPI::Aint MPI::Get_address(void* location)
- location
- Location in caller memory (choice).
- address
- Address of location (integer).
- IERROR
- Fortran only: Error status (integer).
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.
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 environments that
do not support KIND declarations.
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.
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