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Main memory as a hybrid between DRAM and nonvolatile memory is rapidly considered as a basic building block of computing systems. Despite widely-performed researches no one can confirm whether hybrid memory is at its full performance in terms of energy consumption, time delay or both. The main problem is that evaluating their performance in comparison with the optimal performance is challenging since deriving the optimal value is NP-complete. In this paper, the authors design and implement an evaluation framework termed OPAMP, which calculates optimal performance of the hybrid memory environment. This system gathers workload, specification of DRAM and PRAM, and environmental parameters of the hybrid main memory.
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