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copied!<p>This depends a little on what you mean with "model" - you can either refer to the "execution model" or the "programming model" (and perhaps other models as well).</p> <p>For execution models, there are basically two: thread-based or event-based. The Scala standard actor library contains both. The thread-based uses one thread for each actor, whereas the event-based uses a thread-pool. The former is more intuitive to understand, the latter is more efficient. Akka is built on the event-based model.</p> <p>For programming model, there is a big difference between the scala standard library and Akka. In the scala standard library, you basically implement the "run" method - and if you want to wait for an incoming message, you get yourself into a waiting state (by calling "receive" or "react"). So, the programming model follow the "thread-metaphor". However, in Akka, the programming metaphor is that you implement a few life-cycle methods - but the "run"-method is written inside the framework. It actually turns out that this programming model works a lot better with the event-based execution model as well.</p> <p>If you are interested in the different execution models and programming models of scala standard actors I have written <a href="http://dearjunior.blogspot.se/2011/05/scala-actor-waiting-for-godot-vladimir.html" rel="noreferrer">a</a> <a href="http://dearjunior.blogspot.se/2011/05/vladimir-galore-lots-of-threaded-scala.html" rel="noreferrer">few</a> <a href="http://dearjunior.blogspot.se/2011/05/how-heavy-is-estragon-event-based-scala.html" rel="noreferrer">posts</a> on the issue. </p>

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