SHF: Small: Taming the Combinatorial Explosion of Power Management for Future Manycore Systems

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We will soon enter the manycore era, in which systems will includehundreds of cores, large multi-level cache structures, sophisticatednetworks-on-chip, many memory controllers, and huge amounts of mainmemory. These systems will also embody a rich array of powermanagement mechanisms and will strive to achieve high performanceunder various power, energy, and thermal constraints. Unfortunately,the uncoordinated power management of a system's components canproduce oscillating behavior, higher power/energy/temperature, and/orexcessive performance degradation. Given their large number ofhardware components and the wide spectrum of available mechanisms,manycore systems will have to coordinate the actions of their variouspower managers. Moreover, to decide on a (coordinated) course ofaction, these systems will have to comprehensively and rigorouslyreason about various performance and power/energy/temperaturetradeoffs.This project will develop global power coordination (GPC) to manage thecombinatorial explosion of possible power management configurations inmanycore systems. GPC will be realized using an engine that analyzesthe space of possible power state configurations for the entiresystem. It will then decide which configurations are most appropriate,and use per-component power managers to actuate the proper settings.To optimize the search for good configurations, GPC will considergreedy search heuristics that prune the space by relying on noveltechniques that estimate the benefit of power state changes, groupresources with similar power management hooks, and leverage priorobserved behavior and a hierarchical organization.This project will broadly impact society in many ways. First,addressing the power, energy, and temperature problems of manycoresystems can greatly impact the datacenters that run our Internetservices and the high-performance systems that advance our science.Second, tackling these problems will address one of the keytechnological barriers in the computing industry. Third, the projectwill educate graduate, undergraduate, and high-school students, whilebroadening the participation of underrepresented groups in computerscience.