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

未来的多核微处理器将能够配置故障单元，以便在出现磨损故障时允许继续运行。然而，不可预见的缺点是管道不平衡，在这种情况下，管道的其他部分相对于减少配置的功能来说现在是过度供应的。这种不平衡导致芯片范围内的次优功率供应，因为功率现在分配给流水线功能，不再提供它们在功能齐全的芯片中所提供的好处。本研究提出在故障单元解配导致管道不平衡的情况下，动态地重新分配芯片功率。通过再平衡——通过对退化核心内的附加功能进行临时的共生反配置来实现——能量被利用到芯片的其他地方。这种额外的功率被动态地转移到多核芯片的某些部分，这些部分可以通过打开先前休眠的微架构特性来实现性能提升。该项目的技术成果将是：(1)一种新颖的弹性多核系统架构-包括动态功率再分配管理算法-比忽略管道不平衡的系统实现更高的性能；(2)对各种多核工作负载的性能优势进行量化的详细模拟。该项目的更广泛影响涉及综合研究和教育、加强研究基础设施、广泛传播成果以及潜在的社会影响。此外，PI将招募妇女和代表性不足的少数民族学生参与该项目。

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.