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Java thread model is insufficient for large scale parallelism
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Need to take experience from Grande community and provide
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Near term bridges (MPI linked to Java)
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Future Models (Jini linked to Grande algorithms)
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Performance is critical
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Core Java technology such as Hotspot provides raw infrastructure but is not a complete solution
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Numerical computing has special needs in both
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expressivity (e.g. complex types) and
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performance/reproducibility as it is different from system programming (results are data dependent)
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Java Grande framework must address both low level (messaging, floating point coding) and high level interfaces (portals to simulations, immersive worlds ...)
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