[Mpi-forum] MPI-3 pre-proposal

[Jeff Squyres]

I have a "pre-proposal" for the Forum, meaning that I have an idea but  
want to see if others find it valuable before spending the time to  
turn it into a formal proposal.

The general idea is to create a flexible mechanism to both pass hints  
from the user application to the MPI implementation and to pass  
information from the MPI implementation back to the application.  Some  
rough ideas:

- Allow hints to be passed from the app to the implementation on a per- 
handle basis (e.g., on a specific communicator)
- Allow hints to be passed from the app to the implementation for all  
instances of a handle type (e.g., for all communicators)
- Allow hints to be specified before MPI_INIT, or create another  
variant of MPI_INIT that allows passing hints
- Create a mechanism for an MPI implementation to pass arbitrary  
information back to the user, perhaps in response to an arbitrary  
query (maybe something along the lines of an MPI_Info in and and  
MPI_Info out)

Comments?

-- 
Jeff Squyres
Cisco Systems