[Mpi3-bwcompat] Teleconf tomorrow?

[Solt, David George]

Willing to cancel the meeting and discuss in e-mail.  Fab?  Some ideas Fab and I discussed:

1) Drop it
2) Define a minimal set of MPI_XXXXL routines (MPI_IsendL, MPI_Get_elementsL, perhaps some of the non-blocking collectives that can't be "solved" at the user level by wrapping the call and converting into a series of shorter collectives)
This is NOT the same as the proposal of only fixing the output routines.  The idea here is to say that if people needed to send long messages, they really don't need a blocking MPI_SendL or an MPI_Ibsend or an MPI_Alltoall.  We could target very specific routines and just ask for a limited subset.  We could ask outright or ask for them to be "optional" but blessed by the forum.
3)  We could make a very precise statement about the bounds of the current proposal and exactly what is considered compliant code.  One extreme would be to say that (for MPI3.0) an MPI implementation must accept an int wherever an MPI_Count argument is presented, but that someday this restriction may be relaxed and we highly recommend that MPI-3 applications use MPI_Count.   Some implementations may wish to provide large count support by creating a library which defines MPI_Count as 64-bit.  Such a library would technically be non-compliant, but would allow support of large counts for particular applications.  This allows applications to be written in a compliant way and work correctly with both compliant and non-compliant libraries. 

I know Fab was discussing further with Torsten, maybe he has more ideas since I talked with him?

Dave
-----Original Message-----
From: mpi3-bwcompat-bounces_at_[hidden] [mailto:mpi3-bwcompat-bounces_at_[hidden]] On Behalf Of Quincey Koziol
Sent: Thursday, October 14, 2010 10:16 AM
To: MPI-3 backwards compatability WG
Subject: Re: [Mpi3-bwcompat] Teleconf tomorrow?

On Oct 14, 2010, at 10:14 AM, Jeff Squyres wrote:

> I have an mpi3-bwcompat meeting on my calendar tomorrow.
> 
> Is that still on?

        I can't make it (still traveling).

                Quincey

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