MPI_Type_extent(3OpenMPI)MPI_Type_extent(3OpenMPI)NAME
MPI_Type_extent - Returns the extent of a data type, the difference between the upper and lower bounds of the data type -- use of this rou-
tine is deprecated.
SYNTAX C Syntax
#include <mpi.h>
int MPI_Type_extent(MPI_Datatype datatype, MPI_Aint *extent)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_TYPE_EXTENT(DATATYPE, EXTENT, IERROR)
INTEGER DATATYPE, EXTENT, IERROR
INPUT PARAMETER
datatype Datatype (handle).
OUTPUT PARAMETERS
extent Datatype extent (integer).
IERROR Fortran only: Error status (integer).
DESCRIPTION
Note that use of this routine is deprecated as of MPI-2. Please use MPI_Type_get_extent instead.
This deprecated routine is not available in C++.
MPI_Type_extent returns the extent of a data type, the difference between the upper and lower bounds of the data type.
In general, if
Typemap = {(type(0), disp(0)), ..., (type(n-1), disp(n-1))}
then the lower bound of Typemap is defined to be
( min(j) disp(j) if no entry has
lb(Typemap)=( basic type lb
(min(j) {disp(j) such that type(j) = lb} otherwise
Similarly, the upper bound of Typemap is defined to be
(max(j) disp(j) + sizeof(type(j)) + e if no entry has
ub(Typemap)=( basic type ub
(max(j) {disp(j) such that type(j) = ub} otherwise
Then
extent(Typemap) = ub(Typemap) - lb(Typemap)
If type(i) requires alignment to a byte address that is a multiple of k(i), then e is the least nonnegative increment needed to round
extent(Typemap) to the next multiple of max(i) k(i).
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.
SEE ALSO
MPI_Type_get_extent
Open MPI 1.2 September 2006 MPI_Type_extent(3OpenMPI)
Check Out this Related Man Page
MPI_Type_hindexed(3OpenMPI)MPI_Type_hindexed(3OpenMPI)NAME
MPI_Type_hindexed - Creates an indexed datatype with offsets in bytes -- use of this routine is deprecated.
SYNTAX C Syntax
#include <mpi.h>
int MPI_Type_hindexed(int count, int *array_of_blocklengths,
MPI_Aint *array_of_displacements, MPI_Datatype oldtype,
MPI_Datatype *newtype)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_TYPE_HINDEXED(COUNT, ARRAY_OF_BLOCKLENGTHS,
ARRAY_OF_DISPLACEMENTS, OLDTYPE, NEWTYPE, IERROR)
INTEGER COUNT, ARRAY_OF_BLOCKLENGTHS(*)
INTEGER ARRAY_OF_DISPLACEMENTS(*), OLDTYPE, NEWTYPE
INTEGER IERROR
INPUT PARAMETERS
count Number of blocks -- also number of entries in array_of_displacements and array_of_blocklengths (integer).
array_of_blocklengths
Number of elements in each block (array of nonnegative integers).
array_of_displacements
Byte displacement of each block (array of integer).
oldtype Old datatype (handle).
OUTPUT PARAMETERS
newtype New datatype (handle).
IERROR Fortran only: Error status (integer).
DESCRIPTION
Note that use of this routine is deprecated as of MPI-2. Use MPI_Type_create_hindexed instead.
This deprecated routine is not available in C++.
The function is identical to MPI_Type_indexed, except that block displacements in array_of_displacements are specified in bytes, rather
than in multiples of the oldtype extent.
Assume that oldtype has type map
{(type(0), disp(0)), ..., (type(n-1), disp(n-1))},
with extent ex. Let B be the array_of_blocklength argument and D be the array_of_displacements argument. The newly created datatype has
n x S^count-1
(i=0) B[i] entries:
{(type(0), disp(0) + D[0]),...,(type(n-1), disp(n-1) + D[0]),...,
(type(0), disp(0) + (D[0] + B[0]-1)* ex),...,
type(n-1), disp(n-1) + (D[0]+ B[0]-1)* ex),...,
(type(0), disp(0) + D[count-1]),...,(type(n-1), disp(n-1) + D[count-1]),...,
(type(0), disp(0) + D[count-1] + (B[count-1] -1)* ex),...,
(type(n-1), disp(n-1) + D[count-1] + (B[count-1] -1)* ex)}
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.
SEE ALSO
MPI_Type_create_hindexed
MPI_Type_indexed
Open MPI 1.2 September 2006 MPI_Type_hindexed(3OpenMPI)