Abstract-The advent of 3-D fabrication technology makes it possible to stack a large amount of last-level cache memory onto a multi-core die to reduce off-chip memory accesses and, thus, increases system performance. However, the higher power density (i.e., power dissipation per unit volume) of 3-D integrated circuits (ICs) might incur temperature-related problems in reliability, leakage power, system performance, and cooling cost. In this paper, we propose a runtime solution to maximize the performance (i.e., instruction throughput) of chip-multiprocessors with 3-D stacked last-level cache memory, without thermal-constraint violation. The proposed method combines runtime cache tuning (e.g., cache-way partitioning, cache-way power-gating, cache data placement) with per-core dynamic voltage/frequency scaling (DVFS) in a temperature-aware manner. Experimental results show that the integrated method offers 23% performance improvement on average in terms of instructions per second (IPS) compared with temperature-aware runtime cache tuning only.
Energy consumption is a crucial issue of mobile surveillance cameras owing to limited battery capacity. The lifetime of the system is significantly extended by the eventdriven operation; the system mostly stays in sleep mode and wakes up only when an event is detected. In this paper, we propose a design of a low-energy surveillance camera that records events such as the abnormal movement of objects, or physical damage to the camera itself. Unlike conventional event-driven approaches, the proposed system records video from 10 seconds before the event detection because the most critical information is often before or at the moment of event detection, not after the detection. Two different encoders, a low-power encoder and a highcompression encoder, are employed together to implement the low-energy surveillance camera. Experimental results show that the energy consumption of the whole system is reduced by up to 74.9% (by 66.8% on average) compared with conventional always-on system.
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