Re: MPI code error raises a question

On 2008-05-08, Richard Maine <nospam@[EMAIL PROTECTED]
> wrote:
> If, perhaps, you are talking about problems relating to TKR-cheating,

Yes, this is essentially it. From

http://www.open-mpi.org/papers/euro-pvmmpi-2005-fortran/euro-pvm-mpi-2005-fortran.pdf

"""
Not only must interfaces be defined for arrays of each intrinsic data
type, but for each array dimension as well. Depending on the compiler,
there may be approximately 15 type / size combinations.1 Each of these
combinations can be paired with up to a maximum of seven array
dimensions. With approximately 50 MPI functions that have one choice
buffer, this means that 5,250 interface declarations must be specified
(i.e., 15 types × 7 dimensions × 50 functions).  Note that this does
not include the approximately 25 MPI functions with two choice
buffers. This leads to an additional 6.8M interface declarations
(i.e., (15× 7 × 25)2).
"""

In practice, implementations either resort to implicit interfaces in
the MPI module, or provide a subset of explicit interfaces and expect
the programmer to change to the old

INCLUDE 'mpif.h' 

thing in case they do something outside the subset defined in the mpi
module. Or something like that.

For MPI 3, there is an effort underway to implement the kind of
bindings with ISO_C_BINDING as is described in the paper. See

http://svn.mpi-forum.org/trac/mpi-forum-web/wiki/FtnWikiPage

-- 
Janne Blomqvist