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In this paper, the authors propose a novel approach to voltage island formation and core placement for energy optimization in many-core architectures under parameter variations at pre-fabrication stage. They group the cores into irregular "Cloud-shaped" voltage islands. The islands are created by balancing the desire to limit the spatial extent of each island, to reduce PVT impact, with the communication patterns between islands. Compared to using rectangular islands, their approach leads to power improvements between 10 and 12%.
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