> Message 
> passing is fine for concurrent applications that are not CPU bound or for 
> distributed computing but it is not competitive on today's multicore machines 
> and will not become competitive in the next decade.

i don't understand any of this.

>2. How do we avoid excessive copying? What if each parallel thread only 
>requires part of a data structure, should we dissect the data structure to 
>alleviate message passing?

this seems to suggest that message passing implies serialising the data structure.
perhaps i missed something, though.