[Mpi3-hybridpm] First cut at slides

[Jeff Squyres (jsquyres)]

For comment...

Here's a first cut at slides that we discussed yesterday.  It's meant to be a rollup of all the issues surrounding:

- thread safe INIT / FINALIZE
- reference-counting INIT / FINALIZE
- nesting of INIT / FINALIZE

I discovered a new issue when making up these slides: with ref-counting INIT/FINALIZE, since INIT/FINALIZE are collective, we have the same ref counts in all procs in MPI_COMM_WORLD.  But the ref counts may be different in non-COMM_WORLD connected processes.  What happens when they try to finalize over all connected processes?  See slide 12 for an example.  I'm not sure what the right answer is yet.

-- 
Jeff Squyres
jsquyres at cisco.com
For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
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