关键词: 气候模式T106, MIC架构, 混合异构编程, Offload模式

Abstract: Numerical weather model is a basic method and tool of weather forecasting and climate prediction. With the development of technology, the model resolution has improved greatly which brings out the exponentially-increasing computation cost. The time effectiveness of weather forecasting and climate prediction puts forward more advanced requests for the design of parallel program and the performance of computing platform. This paper takes BCC_AGCM_T106 for example to explore the feasibility of hybrid programming and optimization on the Intel  Xeon  PhiTM, implements the hybrid programming of MPI (message passing interface) parallel computation on CPU and OpenMP parallel computation on MIC (many integrated core). The experimental results show that the method can inherit the most of the original MPI parallel computing codes and reduce the developing costs significantly. This paper gets the test data using two CPU processes and an MIC card as an example. The results show that the acceleration performance of climate model T106 core section in MIC accelerates obviously with the number of threads on the MIC card increasing. But compared to the pure MPI program without using the MIC card, acceleration effect is not obvious, which is mainly due to that the calculation amount of T106 core section is insufficient and the data exchange between the MIC card and the host side is too much.

Key words: BCC_AGCM_T106, MIC architecture, hybrid programming, Offload pattern