MPI_Type_get_true_extent - Returns the true lower bound and extent of a data type's corresponding typemap, ignoring MPI_UB and MPI_LB markers.

NAME  SYNTAX  C Syntax  Fortran Syntax (see FORTRAN 77 NOTES)  Fortran 2008 Syntax  INPUT PARAMETER  OUTPUT PARAMETERS  DESCRIPTION  FORTRAN 77 NOTES  ERRORS 

NAME

MPI_Type_get_true_extent, MPI_Type_get_true_extent_x − Returns the true lower bound and extent of a data type’s corresponding typemap, ignoring MPI_UB and MPI_LB markers.

SYNTAX

C Syntax

#include <mpi.h>
int MPI_Type_get_true_extent(MPI_Datatype datatype,

MPI_Aint *true_lb, MPI_Aint *true_extent)

int MPI_Type_get_true_extent_x(MPI_Datatype datatype,

MPI_Count *true_lb, MPI_Count *true_extent)

Fortran Syntax (see FORTRAN 77 NOTES)

USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_TYPE_GET_TRUE_EXTENT(DATATYPE, TRUE_LB, TRUE_EXTENT, IERROR)

INTEGER

DATATYPE, IERROR

INTEGER(KIND=MPI_ADDRESS_KIND) TRUE_LB, TRUE_EXTENT

MPI_TYPE_GET_TRUE_EXTENT_X(DATATYPE, TRUE_LB, TRUE_EXTENT, IERROR)

INTEGER

DATATYPE, IERROR

INTEGER(KIND=MPI_COUNT_KIND) TRUE_LB, TRUE_EXTENT

Fortran 2008 Syntax

USE mpi_f08
MPI_Type_get_true_extent(datatype, true_lb, true_extent, ierror)

TYPE(MPI_Datatype), INTENT(IN) :: datatype

INTEGER(KIND=MPI_ADDRESS_KIND), INTENT(OUT) :: true_lb, true_extent

INTEGER, OPTIONAL, INTENT(OUT) :: ierror

MPI_Type_get_true_extent_x(datatype, true_lb, true_extent, ierror)

TYPE(MPI_Datatype), INTENT(IN) :: datatype

INTEGER(KIND = MPI_COUNT_KIND), INTENT(OUT) :: true_lb, true_extent

INTEGER, OPTIONAL, INTENT(OUT) :: ierror

INPUT PARAMETER

datatype

Data type for which information is wanted (handle).

OUTPUT PARAMETERS

true_lb

True lower bound of data type (integer).

true_extent

True size of data type (integer).

IERROR

Fortran only: Error status (integer).

DESCRIPTION

The true_lb parameter returns the offset of the lowest unit of store that is addressed by the data type, that is, the lower bound of the corresponding typemap, ignoring MPI_LB markers. The true_extent parameter returns the true size of the data type, that is, the extent of the corresponding typemap, ignoring MPI_LB and MPI_UB markers, and performing no rounding for alignment. For both functions, if either the true_lb or true_extent parameter cannot express the value to be returned (e.g., if the parameter is too small to hold the output value), it is set to MPI_UNDEFINED.

The true_extent is the minimum number of bytes of memory necessary to hold a data type, uncompressed.

See § 4.1.8 of the MPI-3 standard for more detailed definitions of these parameters in relation to the typemap.

FORTRAN 77 NOTES

The MPI standard prescribes portable Fortran syntax for the TRUE_LB and TRUE_EXTENT arguments only for Fortran 90. FORTRAN 77 users may use the non-portable syntax

MPI_Type_get_true_extent:

INTEGER*MPI_ADDRESS_KIND TRUE_LB
or
INTEGER*MPI_ADDRESS_KIND TRUE_EXTENT

MPI_Type_get_true_extent_x:

INTEGER*MPI_COUNT_KIND TRUE_LB
or
INTEGER*MPI_COUNT_KIND TRUE_EXTENT

where MPI_ADDRESS_KIND and MPI_COUNT_KIND are constants defined in mpif.h and give the length of the declared integer in bytes.

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.


Updated 2024-01-29 - jenkler.se | uex.se