Message Passing
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Clearly need buffer management, flow control, protocols etc.
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But what is appropriate mechanisms -- need to revisit comparison of active messages versus MPI etc.
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Need to be able to restart separate parts of the (large) hardware independently
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Need to support performance evaluation with different levels of memory hierarchy exposed
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Need Storage management and garbage collection
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PIM micromemory different from hierarchical shared memory
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Need good job and resource management tools
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Checkpoint/restart only needed at natural synchoronization points
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