ParaScale: Exploiting Parametric Timing Analysis for Real-Time Schedulers and Dynamic Voltage Scaling

Static timing analysis safely bounds worst-case execution times to determine if tasks can meet their deadlines in hard real-time systems. However, conventional timing analysis requires that the upper bound of loops be known statically, which limits its applicability. Parametric timing analysis methods remove this constraint by providing the WCET as a formula parameterized on loop bounds. This paper contributes a novel technique to allow parametric timing analysis to interact with dynamic real-time schedulers. By dynamically detecting actual loop bounds, a lower WCET bound can be calculated, on-the-fly, for the remaining execution of a task. We analyze the benefits from parametric analysis in terms of dynamically discovered slack in a schedule. We then assess the potential for dynamic power conservation by exploiting parametric loop bounds for ParaScale, our intra-task dynamic voltage scaling (DVS) approach. Our results demonstrate that the parametric approach to timing analysis prov...

• Type: Conference
• Year: 2005
• Where: RTSS
• Authors: Sibin Mohan, Frank Mueller, William Hawkins, Michael Root, Christopher A. Healy, David B. Whalley
• Keywords: Applied Computing, Loop Bounds, Parametric Timing Analysis, RTSS 2005, Timing Analysis