SHF: Small: Dynamic Power Redistribution in Failure-Prone CMPs

未来的多核微处理器将能够解除故障单元的配置，以便在出现磨损故障的情况下继续运行。然而，不可预见的缺点是管道不平衡，其中管道的其他部分现在相对于取消配置的功能被过度配置。这种不平衡导致了次优的芯片范围的功率供应，因为功率现在被分配给流水线功能，这些流水线功能不再提供它们在全功能芯片上所提供的好处。本研究建议在流水线不平衡的情况下动态地重新分配芯片功率。通过重新平衡--通过在降级的核心内临时、共生地取消配置额外的功能来实现--电能被利用起来，供芯片上的其他地方使用。这一额外的功率被动态地转移到多核芯片的部分，该多核芯片可以通过开启先前休眠的微体系结构特征来实现性能提升。该项目的技术成果将是：(1)新的弹性多核系统体系结构--包括动态功率重新分配管理算法--比不受管道不平衡影响的体系结构获得更高的性能；以及(2)量化各种多核工作负载的这种性能优势的详细模拟。该项目的更广泛影响涉及综合研究和教育、增强的研究基础设施、广泛的成果传播和潜在的社会影响。此外，国际和平协会将招募妇女和代表不足的少数族裔学生参与该项目。

Future multi-core microprocessors will be capable of deconfiguring faulty units in order to permit continued operation in the presence of wear-out failures. However, the unforeseen downside is pipeline imbalance in which other portions of the pipeline are now overprovisioned with respect to the deconfigured functionality. Such an imbalance leads to sub-optimal chip-wide power provisioning, since power is now allocated to pipeline functions that no longer provide the benefit they did with a fully functioning chip.This research proposes to dynamically redistribute the chip power under pipeline imbalances that arise from deconfiguring faulty units. Through rebalancing -- achieved by temporary, symbiotic deconfiguration of additional functionality within the degraded core -- power is harnessed for use elsewhere on the chip. This additional power is dynamically transferred to portions of the multi-core chip that can realize a performance boost from turning on previously dormant microarchitectural features. The technical deliverables of this project will be: (1) a novel resilient multi-core system architecture -- including dynamic power redistribution management algorithms -- that achieves much higher performance than one that is oblivious to pipeline imbalances; and (2) detailed simulations that quantify this performance advantage for various multi-core workloads.The broader impacts of this project relate to integrated research and education, enhanced infrastructure for research, broad dissemination of results, and potential societal impact. Furthermore, the PI will recruit women and underrepresented minority students to work on the project.