Research on thermal aware real-time scheduling
Guowei Wu · Computer Engineering and Applications Journal · 2011
Temperature rise of the multi-core processor jeopardizes the performance of processor.DTM(Dynamic Thermal Management) mechanism is a hardware level thermal management method with a great loss of processor's performance.This paper proposes a dynamic thermal management mechanism for real-time tasks in the operating system level called LTEDF(Low Thermal Early Deadline First).It gets the value of performance counters online and then calculates the cores'temperature which can be used to decide which core to run a new process.Also,this paper proposes a heuristic method called MST(Maximum Scheduling Threshold).The algorithm is simulated on HotSpot simulator.Simulation results show that algorithm of this paper can not only schedule the tasks before the deadlines,but also minimize the thermal penalty.Also,LTEDF can create a more uniform power density map than the traditional EDF(Early Deadline First) algorithm without thermal awareness and some thermal-aware algorithms,and reduce the number of thread migration by using MST heuristic method.