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The growing use of multi-core and networked computing systems is increasing the importance of developing reliable parallel and distributed code. Unfortunately, developing and testing such code is notoriously hard, especially for shared-memory models of programming. The actor model offers a promising alternative paradigm based on message passing. Essentially, an actor is an autonomous concurrent object which interacts with other actors only by exchanging messages. In actor-based systems, the key source of non-determinism is the order in which messages are delivered to - and processed by - the actors. Bugs can still occur in actor programs as the interleaving of messages may be incorrect, or the sequential code within an actor can have bugs.
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