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The pin count largely determines the cost of a chip package, which is often comparable to the cost of a die. In 3D processor-memory designs, power and ground (P/G) pins can account for the majority of the pins. This is because packages include separate pins for the disjoint processor and memory power delivery networks (PDNs). Supporting separate PDNs and P/G pins for processor and memory is inefficient,...
This paper characterizes voltage noise in GPU architectures running general purpose workloads. In particular, it focuses on resonance-induced voltage noise, which is caused by workload-induced fluctuations in power demand that occur at the resonance frequency of the chip's power delivery network. A distributed power delivery model at functional unit granularity was developed and used to simulate supply...
Voltage noise and manufacturing process variation represent significant reliability challenges for modern microprocessors. Voltage noise is caused by rapid changes in processor activity that can lead to timing violations and errors. Process variation is caused by manufacturing challenges in low-nanometer technologies and can lead to significant heterogeneity in performance and reliability across the...
Power consumption is a primary concern for microprocessor designers. Lowering the supply voltage of processors is one of the most effective techniques for improving their energy efficiency. Unfortunately, low-voltage operation faces multiple challenges going forward. One such challenge is increased sensitivity to voltage fluctuations, which can trigger so-called “voltage emergencies” that can lead...
Lowering supply voltage is one of the most effective techniques for reducing microprocessor power consumption. Unfortunately, at low voltages, chips are very sensitive to process variation, which can lead to large differences in the maximum frequency achieved by individual cores. This paper presents Booster, a simple, low-overhead framework for dynamically rebalancing performance heterogeneity caused...
Energy efficiency is a primary concern for microprocessor designers. One very effective approach to improving processor energy efficiency is to lower its supply voltage to very near to the transistor threshold voltage. This reduces power consumption dramatically, improving energy efficiency by an order of magnitude. Low voltage operation, however, increases the effects of parameter variation resulting...
Stencil computations comprise the compute-intensive core of many scientific applications. The data access pattern of stencil computations often requires several adjacent data elements of arrays to be accessed in innermost parallel loops. Although such loops are vectorized by current compilers like GCC and ICC that target short-vector SIMD instruction sets, a number of redundant loads or additional...
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