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MPI_Type_hvector - Creates a vector (strided) datatype with offset
in bytes -- use of this routine is deprecated.
#include <mpi.h>
int MPI_Type_hvector(int count, int blocklength, MPI_Aint stride,
MPI_Datatype oldtype, MPI_Datatype *newtype)
INCLUDE ’mpif.h’
MPI_TYPE_HVECTOR(COUNT, BLOCKLENGTH, STRIDE, OLDTYPE, NEWTYPE,
IERROR)
INTEGER COUNT, BLOCKLENGTH, STRIDE, OLDTYPE
INTEGER NEWTYPE, IERROR
- count
- Number of blocks (nonnegative integer).
- blocklength
- Number of elements in each block (nonnegative integer).
- stride
- Number of bytes between start of each block (integer).
- oldtype
- Old datatype (handle).
- newtype
- New datatype (handle).
- IERROR
- Fortran only: Error status (integer).
Note that use
of this routine is deprecated as of MPI-2. Use MPI_Type_create_hvector instead.
This deprecated routine is not available in C++.
The function MPI_Type_hvector
is identical to MPI_Type_vector, except that stride is given in bytes,
rather than in elements. The use for both types of vector constructors is
illustrated in the examples in Section 3.12.7 of the MPI-1 Standard.
Assume
that oldtype has type map
{(type(0), disp(0)), ..., (type(n-1), disp(n-1))}
with extent ex. Let bl be the blocklength. The newly created datatype has
a type map with count * bl * n entries:
{(type(0), disp(0)), ..., (type(n-1), disp(n-1)),
(type(0), disp(0) + ex), ..., (type(n-1), disp(n-1) + ex),
..., (type(0), disp(0) + (bl -1) * ex),...,(type(n-1),
disp(n-1) + (bl -1) * ex), (type(0), disp(0) + stride),
...,(type(n-1), disp(n-1) + stride), ..., (type(0),
disp(0) + stride + (bl - 1) * ex), ..., (type(n-1),
disp(n-1) + stride + (bl -1) * ex), ..., (type(0),
disp(0) + stride * (count -1)), ...,(type(n-1),
disp(n-1) + stride * (count -1)), ..., (type(0),
disp(0) + stride * (count -1) + (bl -1) * ex), ...,
(type(n-1), disp(n-1) + stride * (count -1) + (bl -1) * ex)}
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.
MPI_Type_create_hvector
MPI_Type_vector
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