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We can support any given paradigm at either high functionality (web server) or high performance (backend) level
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HPCC Messaging could be a Java/RMI middle tier MPI or Nexus/Optimized Machine specific MPI at backend
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JWORB supports CORBA based RTI already and we can bridge to high performance event driven simulation systems like SPEEDES at the high performance backend layer
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However most problems can be thought of a set of coarse grain entities which are internally data parallel but the coarse grain structure is "functional" parallelism
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So HLA/RTI is especially natural as tier 2 management level of these coarse entities
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Entities can be time synchronized simulations and use MPI(HPF?) at either middle or back end tier or in fact as in DMSO simulations a federate running a custom discrete event simulation
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