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Seem to be easiest for PIM architectures for classic geometrically data parallel problems -- even if adaptive and irregular (these are "engineering" issues)
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Must extend MPI HPF .. HPJava to support several layers of memory hierarchy
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Need to study data movement in key algorithms and how they can be supported in all prototypical architectures
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Can possibly use "load balancing ideas" (developed for decomposition onto CPU's today) to address fine grain memory hierarchy decomposition in PetaFlop architectures
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Need layered software model with capability to "escape" to lower levels
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