Reactive speed control in temperature-constrained real-time systems

In this paper we study temperature-constrained real-time systems, where real-time guarantees must be met without exceeding safe temperature levels within the processor We give a short review on temperature issues in processors and describe how speed control can be used to trade-off task delays against processor temperature. In this paper we describe how traditional worst-case execution scenarios do not apply in temperature-constrained situations. As example, we adopt a simple reactive speed control technique. We show how this simple reactive scheme can improve the processor utilization compared with any constant-speed scheme.