[mpiwg-p2p] Communicator assertions

[Jim Dinan]

All,

Thanks for your feedback.  Here is a new draft of the slides.  I tried to
capture all of the discussion on this thread, but may have missed some
things.  Please feel free to update the slides directly.

Cheers,
 ~Jim.

On Sun, Feb 22, 2015 at 1:22 PM, Balaji, Pavan <balaji at anl.gov> wrote:

>
> If this proposal is being put forward, there needs to be a thorough
> discussion of why info keys are not sufficient.  Inheritance is an issue
> but the semantics part is being misunderstood, IMO.
>
> The user hinting that some functionality of MPI will not be used is not a
> change of semantics for the MPI implementation.  It is simply the user
> telling the MPI implementation that she does not need the full generality
> of the MPI standard in that particular instance.  The MPI implementation
> does not even need to honor that hint.  The "mpi_no_locks" hint in RMA is
> an example of that (there are other such hints as well).
>
> So before we go too far down this path, we need to understand what exactly
> the info model is lacking.  If inheritance is the only issue, there are
> other alternatives we could pursue.  If we say that MPI info cannot be used
> to restrict functionality in the MPI implementation, then many hints in the
> standard need to be removed (which is not backward compatible).  We cannot
> leave those in the standard *and* say that info semantics don't allow them.
>
>   -- Pavan
>
> > On Feb 20, 2015, at 8:00 PM, Jim Dinan <james.dinan at gmail.com> wrote:
> >
> > Hi All,
> >
> > I would like to raise communicator assertions (was communicator info
> keys) for discussion again at the upcoming meeting.  I have attached a
> rough sketch of two possible directions for the proposal.
> >
> > The goal with these slides is to create an outline that can be used for
> discussion in the P2P WG meeting.  Please send feedback, rotten tomatoes,
> or questions.
> >
> > Cheers,
> >  ~Jim.
> > <MPI Communicator Assertions Straw
> Man.pdf>_______________________________________________
> > mpiwg-p2p mailing list
> > mpiwg-p2p at lists.mpi-forum.org
> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-p2p
>
> --
> Pavan Balaji  ✉️
> http://www.mcs.anl.gov/~balaji
>
> _______________________________________________
> mpiwg-p2p mailing list
> mpiwg-p2p at lists.mpi-forum.org
> http://lists.mpi-forum.org/mailman/listinfo.cgi/mpiwg-p2p
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