[mpiwg-rma] MPI_WIN_CREATE for intercommunicators

[Jeff Hammond]

On Tue, Feb 11, 2014 at 10:57 AM, Jim Dinan <james.dinan at gmail.com> wrote:
> Being on this list should be good.  If you create an account on the trac
> page, you can also add yourself to the cc list for the ticket.  You're also
> welcome to join meetings; right now we are focused on the March face-to-face
> meeting deadlines so we won't be able to work in any new business until
> after that.  Changing the standard is a long process, so this could take a
> while, but staying involved to provide motivating use cases would be very
> helpful.  :)

I engaged the RMA WG some time in 2008-2009 and had to wait until
2012-2013 to get what I wanted, but it has been worth it.
Fortunately, what Thomas is asking for is much easier than "give me
everything I need for Global Arrays" :-)

Jeff

>> > This sounds like a reasonable proposal to me; it should be possible to
>> > create a
>> > sane definition for windows on intercommunicators.  The RMA interface
>> > has
>> > focused on intracommunicators, so it could require several additions to
>> > e.g.
>> > make it possible to query both local and remote groups from the window.
>> > I think
>> > the main argument against adding this would be the increased complexity
>> > in the
>> > standard and to implementations.  Given that there is a workaround
>> > (flattening
>> > the communicator to make the window, and using post/start/complete/wait
>> > to
>> > restrict the set of communication peers in active target), we would need
>> > to
>> > motivate such a change.
>> >
>> > I captured your proposal in a ticket,
>> > https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/412, so we remember
>> > to
>> > discuss this further in the RMA working group.
>>
>> thank you. Will remaining subscribed to this list be sufficient to receive
>> notice of updates or should I poll above issue every few weeks?
>>
>> Regards, Thomas
>> --
>> Thomas Jahns
>> DKRZ GmbH, Department: Application software
>>
>> Deutsches Klimarechenzentrum
>> Bundesstraße 45a
>> D-20146 Hamburg
>>
>> Phone: +49-40-460094-151
>> Fax: +49-40-460094-270
>> Email: Thomas Jahns <jahns at dkrz.de>
>>
>>
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-- 
Jeff Hammond
jeff.science at gmail.com