Parallel collections in Scala 2.9 and Actors?

They solve different problems . Actors are good at solving task parallel problems . While parallel collections are good at solving data parallel problems .

I don't think they are mutually exclusive - you can use parallel collections in actors and parallel collections containing actors.

Actors library in Scala is just one of the options, approaches to concurrency, among many (threads & locks, STM, futures/promises), and it's not supposed to be used for all kinds of problems, or to be combinable with everything (though actors and STM could make a good deal together). In some cases, setting up a group of actors (workers + a supervisor) or explicitly splitting up a task into portions, to feed them to the fork-join pool, is too cumbersome, and it's just way handier to call . Par on an existing collection you're already using, and simply traverse it in a parallel, gaining a performance benefit almost for free (in terms of setup).

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