[MPIWG Fortran] Question about an argument of MPI_Testall
wgropp at illinois.edu
Wed Mar 12 10:42:42 CDT 2014
Should this be an optional argument in that case, and eliminate MPI_STATUS_IGNORE and MPI_STATUSES_IGNORE, as was done for the C++ interface?
Director, Parallel Computing Institute
Thomas M. Siebel Chair in Computer Science
University of Illinois Urbana-Champaign
On Mar 12, 2014, at 10:30 AM, Jeff Squyres (jsquyres) wrote:
> Rolf R. just reminded me off-list what the real reason is: MPI_STATUSES_IGNORE.
> We can't know what the (count) will be, but you still must be able to pass MPI_STATUSES_IGNORE through that dummy argument. Hence, it must be (*), not (count).
> Keep in mind that the spec prohibits you from having a special type for MPI_STATUSES_IGNORE. I.e., it must be Type(MPI_Status) so that tools can know how to intercept it properly.
> Make sense?
> On Mar 12, 2014, at 5:25 AM, N.M. Maclaren <nmm1 at cam.ac.uk> wrote:
>> On Mar 12 2014, Malcolm Cohen wrote:
>>> That reason is bogus, if the dummy argument is declared to have "count" elements the actual argument is required to have at least "count" elements, but this need not be exact. The Fortran standard states
>>> "The rank and shape of the actual argument need not agree with the rank and shape of the dummy argument, but the number of elements in the dummy argument shall not exceed the number of elements in the element sequence of the actual argument."
>>> (F2008 188.8.131.52)
>> And that has been true since Fortran II - I have just checked that it
>> was explicitly stated there, too.
>> Nick Maclaren.
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>> mpiwg-fortran at lists.mpi-forum.org
> Jeff Squyres
> jsquyres at cisco.com
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