A dynamic-mode DVS algorithm under dynamic workloads
Yan Wang, Albert M. K. Cheng · ACM SIGBED Review · 2005
Dynamic Voltage Scaling (DVS) is a promising method to achieve energy saving by slowing down the processor into multiple frequency levels especially in battery-operated embedded systems. We introduce a novel Dynamic-Mode EDF scheduling algorithm when workloads change significantly. Single-Mode, Dual-Mode and Three-Mode frequency setting formats can be applied, based on the Real Execution Time (RET) and the slack time at run-time. Only one combination of the time zone length and the frequency scaling factor can lead to the best energy saving. Experimental results show that, given an RET pattern, our Dynamic-Mode DVS algorithm achieves an average 15% energy savings over the traditional two-mode DVS scheme on hard real-time systems.