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Dynamic process creation is very useful for a broader range
especially applications which must be fault tolerant (e.g., factory
floor, stock exchange, hospitals, space shuttle), but is of lesser
importance for scientific and engineering computational programs.
- Dynamic process creation (PVM and ISIS had that), but it
comes back in MPI-2.
- No portable I/O model, but it comes in MPI-2 (thanks to NASA).
- Virtual Synchrony (ISIS had that) - we probably won't see that
in MPI, but we get it back in Microsoft's Wolfpack.