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Javelin is a Java-based infrastructure for parallel Internet computing. This paper presents Javelin 2.0, focusing on the enhancements that distinguish it from prior versions of Javelin 9, 16, 15]. With regard to architecture, the paper presents enhancements that facilitate aggregating larger sets of host processors. The paper then presents: a branch-and-bound computational model, the supporting Javelin 2.0 architecture, a scalable task scheduler using distributed work-stealing, a distributed eager scheduler, implementing fault tolerance, and the results of performance experiments. Taken as a whole, Javelin 2.0 frees application developers from concerns about complex interprocessor communication and fault tolerance among Internetworked hosts. When all or part of their application can be cast as a piecework or a branchand-bound computation, Javelin 2.0 allows developers to focus on the underlying application without sacri cing performance.

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