Title:
A Power Capping Controller for Multicore Processors
A Power Capping Controller for Multicore Processors
Author(s)
Almoosa, Nawaf
Song, William
Wardi, Yorai Y.
Yalamanchili, Sudhakar
Song, William
Wardi, Yorai Y.
Yalamanchili, Sudhakar
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Abstract
This paper presents an online controller for
tracking power-budgets in multicore processors using dynamic
voltage-frequency scaling. The proposed control law comprises
an integral controller whose gain is adjusted online based on
the derivative of the power-frequency relationship. The control
law is designed to achieve rapid settling time, and its tracking
property is formally proven. Importantly, the controller design
does not require off-line analysis of application workloads
making it feasible for emerging heterogeneous and asymmetric
multicore processors. Simulation results are presented for
controlling power dissipation in multiple cores of an asymmetric
multicore processor. Each core is i) equipped with the controller,
ii) assigned a power budget, and iii) operates independently
in tracking to its power budget. We use a cycle-level multicore
simulator driven by traces from SPEC2006 benchmarks
demonstrating that the proposed algorithm achieves a faster
settling time than examples of a static setting of the controller
gain.
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Date Issued
2011
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Text
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Technical Report