You may want to look into the Merlin runtime for Self.

Adaptive Compilation in the Merlin System for Parallel Machines (10 pages) 
<http://www.lsi.usp.br/~jecel/jpaper1.ps.gz>


To wet the appetite:
"So, even with top level messages defined as sequential, one in every four 
sends potentially adds to the prallelism of a program"




HTH,

Reinout
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