We designed and implemented an EARTH (efficient architecture for unning threads) runtime system for a multiprocessor/multinode, cluster. For portability, we built this runtime system on top of pthreads under Linux. This implementation enables the overlapping of communication and computation on a cluster of symmetric multiprocessors (SMP), andlets the interruptions generated by the arrival of new data drive the system, rather than relying on network polling. We describe how our implementation of a multithreading model on a multiprocessor/multinode system arranges the execution and the synchronization activities to make the best use of the resources available, and how the interaction between the local processing and the network activities are organized.
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