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Many Core Design from a Thermal Perspective: Extended Analysis and Results

Huang, Wei; Stan, Mircea; Sankaranarayanan, Karthik; Ribando, Robert; Skadron, Kevin
Huang, Wei
Stan, Mircea
Sankaranarayanan, Karthik
Ribando, Robert
Skadron, Kevin
Air cooling limits have been a major design challenge in recent years for integrated circuits. Multi-core exacerbates thermal challenges because power scales with the number of cores, but also creates new opportunities for temperature-aware design, be- cause multi-core designs offer more design parameters than single-core designs. This technical report investigates the relationship between core size and on-chip hot spot temperature and shows that with the same power density, smaller cores are cooler than larger cores due to a spatial low-pass filtering effect of temperature. This phenomenon suggests that designs exploiting low-pass filtering can dissipate more power within the same cooling budget than contemporary designs. We also find a decrease of within- core spatial temperature variation for many-core designs,indicating that thermal analysis can be potentially carried out at the core granularity in the future. This report also presents more results in addition to the DAC paper and includes a derivation of the location of the isotherm in the Appendix. Accurately locating the isotherm is required for an accurate temperature model for homogeneous many-core chips.
University of Virginia, Department of Computer Science, 2008
Published Date
Libra Open Repository
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