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I was reading the Wikipedia article on Actor model and came across this line-

...bridging the chasm between local and nonlocal concurrency.

What is this "non-local" concurrency and how is it different from "local" concurrency?

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Local concurrency is defined as "within a system" (e.g. a multi-core CPU), nonlocal concurrency is defined as "between systems" (e.g. multiple systems interconnected by, for example, a web services interface).

The main differences are the required mechanisms on how to move context around and synchronize it - Which is obviously easier when faced with local concurrency.

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