Graceful Performance Modulation for Power-Neutral Transient Computing Systems
Graceful Performance Modulation for Power-Neutral Transient Computing Systems
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DOI：
10.1109/tcad.2016.2527713
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发表时间：
2016-05-01
影响因子：
2.9
通讯作者：
Benini, Luca
中科院分区：
文献类型：
--
作者：
Balsamo, Domenico;Das, Anup;Benini, Luca
瞬态计算系统没有能量存储，直接通过能量收集进行操作。这些系统通常面临低电流或瞬态电源的固有挑战。在本文中，我们提出了“功率中性”操作，这是此类系统的新范例，其中系统的瞬时功耗必须与瞬时收获的功率相匹配。使用动态频率调节控制算法实现功率中性，根据输入功率优雅地调节系统性能。详细的系统模型用于确定设计参数，以选择系统电压阈值，其中工作频率将升高或降低，或者系统将休眠。使用结合基于电压阈值的中断进行频率缩放的微控制器对所提出的中性电源操作控制算法进行了实验验证。微控制器直接由真正的能量采集器供电；结果表明，中性电源系统的运行时间延长了 4%-88%，应用程序执行速度提高了 21%。
Transient computing systems do not have energy storage, and operate directly from energy harvesting. These systems are often faced with the inherent challenge of low-current or transient power supply. In this paper, we propose "power-neutral" operation, a new paradigm for such systems, whereby the instantaneous power consumption of the system must match the instantaneous harvested power. Power neutrality is achieved using a control algorithm for dynamic frequency scaling, modulating system performance gracefully in response to the incoming power. Detailed system model is used to determine design parameters for selecting the system voltage thresholds where the operating frequency will be raised or lowered, or the system will be hibernated. The proposed control algorithm for power-neutral operation is experimentally validated using a microcontroller incorporating voltage threshold-based interrupts for frequency scaling. The microcontroller is powered directly from real energy harvesters; results demonstrate that a power-neutral system sustains operation for 4%-88% longer with up to 21% speedup in application execution.