Runtime energy management under real-time constraints in MPSoCs
Andre Martins, Marcelo Ruaro, Anderson Camargo Sant'Ana, Fernando Moraes · 2017
The workload of many-core systems includes real-time (RT) applications. Obtain energy savings while executing RT applications is a challenge due to the RT timing constraints. The techniques used to reduce the consumption, as dynamic voltage and frequency scaling (DVFS), usually delays the applications, leading to constraint violations. Most works in the literature ensure RT constraints based on design-time analysis of the expected workload by defining the voltage and frequency levels. Our main contribution is the proposal of a Runtime Energy Management for RT applications (RT-REM), using monitored data, and DVFS and task mapping as actuation policies. Supervising the application slack time enables to save energy of RT applications. Evaluations on many-core systems (up to 144 PEs), achieves 18% in energy savings, keeping constraint misses below 2.5%. Our proposal stands out from related works regarding scalability, realistic and accurate energy estimation, and absence of design-time analysis of the application set.