[Mpi3-subsetting] agenda for subsetting kickoff telecon ww09

[Torsten Hoefler]

Bronis,
for the record: I do *not* advocate to get rid of datatypes! I think
datatypes are a great thing for some parallel applications and they
certainly should be used as a high-level abstraction. I've implemented
scatter/gather list-based optimizations for modern NICs (IB). 

But on the other hand, there are many codes out there that do just not
use datatypes. Codes that are only supposed to run in heterogeneous
environments. Codes that use sockets instead of MPI. If we want to aim
at this market, we need to simplify here. A simplification could be to
use MPI_BYTE by default ;) but it would be better to get rid of the code
and control-path overhead. 

Just to clarify my opinion,
  Torsten


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