Query: mpi_type_get_true_extent
OS: osx
Section: 3openmpi
Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar
MPI_Type_get_true_extent(3OpenMPI) MPI_Type_get_true_extent(3OpenMPI)NAMEMPI_Type_get_true_extent - Returns the true lower bound and extent of a data type's corresponding typemap, ignoring MPI_UB and MPI_LB mark- ers.SYNTAXC Syntax #include <mpi.h> int MPI_Type_get_true_extent(MPI_Datatype datatype, MPI_Aint *true_lb, MPI_Aint *true_extent) Fortran Syntax (see FORTRAN 77 NOTES) 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 C++ Syntax #include <mpi.h> void MPI::Datatype::Get_true_extent(MPI::Aint& true_lb, MPI::Aint& true_extent) constINPUT PARAMETERdatatype Data type for which information is wanted (handle).OUTPUT PARAMETERStrue_lb True lower bound of data type (integer). true_extent True size of data type (integer). IERROR Fortran only: Error status (integer).DESCRIPTIONThe 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. The true_extent is the minimum number of bytes of memory necessary to hold a data type, uncompressed. See Section 4.14.3 of the MPI-2 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 INTEGER*MPI_ADDRESS_KIND TRUE_LB or INTEGER*MPI_ADDRESS_KIND TRUE_EXTENT where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives the length of the declared integer in bytes.ERRORSAlmost 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. Open MPI 1.2 September 2006 MPI_Type_get_true_extent(3OpenMPI)
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