This architecture is more general than that needed to support MPI like parallel computing
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It includes ideas present in systems like Condor and Javelin
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The diagram only shows server (bottom) and service (top) layers. There is of course a client layer which communicates directly with "Parallel Computing (PC) Control and Services module"
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We assume that each workstation has a "Jini client" called here a "Jini Parallel Computing (PC) Embryo" which registers the availability of that workstation to run either particular or generic applications
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We do not use term Jini client as this is confusing with client machines of users
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The Jini embryo can represent the machine (I.e. ability to run general applications) or particular software
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The Gateway or "Parallel Computing (PC) Control and Services module" queries Jini lookup server to find appropriate service computers to run a particular MPI job
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It could of course use this mechanism "just" to be able to run a single job or to set up a farm of independent workers
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