Research On Energy-efficient And Thermal-balanced Mapping Algorithm For NoC

Optimizing mapping has become a hot research field for No C in recent years.At present,NoC mapping studies mainly focus on two-dimensional topological structure,and the optimization goal is mainly to reduce total energy consumption of the system.However in an actual application,multiple tasks maybe correspond to one IP core.It is necessary to consider how to map multiple tasks to one IP core.One way is to map IP core with lager scale communication to the closest position in Manhattan distance.Though the total energy consumption of the system is reduced,hot local region will be derived.Temperature imbalance inside the chip will lead to skewness of clock signal and other system failures.Aiming at above problems,an Energy-Efficient and Thermal-Balanced Mapping Algorithm on base of voltage-frequency island EETB-VFIs technology is proposed in this paper.In this way,it can reduce total energy consumption of the system.Moreover it avoids local temperature in chip becoming too high to negatively impact system.In order to make a quantitative calculation on heat and total system energy consumption of the system,an energy consumption model and a heat model are proposed according to the structure of 3D-Mesh NoC.In EETB-VFIs mapping technology,mapping is divided into two stages: task mapping and IP mapping.K-Means clustering algorithm is applied in the task mapping stage.It can place similar tasks into one integrated category and distribute the tasks in the same category into one IP core.In this way,the amount of communication between cores is reduced.IP mapping contains five steps of IP voltage and frequency distribution,voltage and frequency island division,IP cores mapping,VFI voltage and frequency distribution and heat balance adjustment.In the step of IP cores mapping,the premise is choosing map region where to mapping the IP cores according to the voltage.Thus voltage island effect will not be avoided.While in the step of heat balance adjustment,pair-wise interchange technology is employed to adjust the position of IP cores and then to clear hot regions.Finally,simulations and evaluations on energy consumption and heat distribution are gained improving Access Noxim simulator.The property of EETB-VFIs mapping technology is analyzed by comparing with the technologies of the random mapping and Jang mapping.The experimental results show that the EETB-VFIs mapping technique not only can reduce total energy consumption of the system and effectively maintain the system heat balance,but also avoid high peak temperature.In this way,the mapping with Energy-Efficient and Thermal-Balanced is achieved.