The actor model is a high-level programming abstraction that attempts to ease the development of parallel applications, among others, by shielding the developer from the underlying platform. In this model the execution relies on a runtime environment (RE) to be able to efficiently use the underlying machine. Modern processors possess a hierarchical architecture of memory, thus making the performance of an application dependent on the placement of the application threads. This makes the choices

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... f the RE much more important since the chosen actor placement will have a considerable impact on the application performance. In this paper we describe a work in progress that aims to create an on-line automatic actor placement engine. Using application profiling in association with hardware counters, it will pin and migrate actors to processing units aiming to optimize performance.