Simulation And Implementation Of Low-Power Designment For HPC Interconnection Network

With the performance of parallel computer systems forwarding to exascale from petascale,the high power consumption is becoming the hamper of system scalability.The CMOS circuit consumes both static and dynamic energy.The ratio of static to dynamic energy shifts as leakage current increases with each technology generation.Presently,static energy reduction for supercomputers is mainly achieved by turning off unused components,and run-time power-gating methods of computing nodes have more in-depth research.Routers consume most of the static energy used by the underlying network,however,presently there are no effective methods for switching off idle routers in supercomputing systems.Based on the existed research of low-power technology,this study mainly contains three aspects: the hardware low-power designment,the software-guided low-power designment and the power simulation for HPC interconnection network.Firstly,we proposed a hardware low-power design scheme for HPC interconnection network.This scheme is based on the multiple network technology,and the basic ideas is that computing nodes can adaptively choose subnets to inject packets based on the congestion states of subnets.All the flits of a packet travel in the same subnet and switch on/off routers dynamicly based on router power-gating technology until they reach the destination,which provides the opportunities for static power optimization for HPC interconnection network.Secondly,We propose the software-guided low-power design scheme for HPC interconnection network.We implement three topology-aware resource allocation methods,which can close routers based on routing-policy guided topology partitioning methodologies.We design the software-guided low-power scheme based on Tianhe-2 software platfoam,and evaluate three topology-aware resource allocation strategies on Tianhe-2and a simulator for the aforementioned network topologies and routing policies.The result shows that our scheme can achieve the largest energy saving of 79.7% on Tianhe-2with 92% utilization of computing nodes.Lastly,we design and initially implement the HPC interconnection network power simulator HPC-NetSim.We present the detailed introduction of design scheme and initially implement the HPC-NetSim simulator,and show the implementation details of main function modules.The mean error of performance simulation of HPC-NetSim is only 2.7%,and the energy results and overheads show good agreement with the theoretical analysis.