并行I/O技术在气候数值模式中的应用研究  

Study and Application of Parallel I/O Technology in Numerical Climate Model

作　　者：魏敏[1,2] 徐金秀[3] 王在志[4] 

机构地区：[1]中国气象局国家气象信息中心,北京100081 [2]清华大学地球系统科学研究中心,北京100084 [3]江南计算技术研究所,江苏无锡214083 [4]中国气象局国家气候中心,北京100081

出　　处：《计算机技术与发展》2014年第12期11-15,19,共6页Computer Technology and Development

基　　金：国家"973"重点基础研究发展计划项目(2010CB951902);公益性行业专项(气象)科研专项(GYHY201106022;GYHY201306062)

摘　　要：在气候变化数值模拟工作中,气候数值模式运行效率主要受到计算效率和I/O效率的共同影响。目前,模式计算部分已经基本实现并行,计算效率显著提升。随着气候数值模式时空分辨率的提高,对I/O效率的需求也不断增加,数据并行I/O技术已经成为提高模式整体运行效率的有效方法之一。文中深入分析了BCC_AGCM模式串行I/O算法及NetCDF数据结构特点,采用基于MPI-IO的高层I/O库对模式I/O算法进行并行优化,优化后可支持多类气象要素并行输出,输出效率明显提升。为我国应对气候变化数值模式的运行效率优化工作,进行了有益的技术探索和积累。Computational efficiency and I / O efficiency affect the efficiency of numerical climate model together in climate change numerical simulation. M odel computation section has been parallelized and the efficiency significantly increased. With the improvement of spatial and temporal resolution of numerical climate model,the demand of data access efficiency is also increased dramatically. The parallel I / O technology has become an effective method to improve the efficiency of numerical climate model. In this paper,analyze the serial I / O algorithm of BCC_AGCM mode and the data structure features of Net CDF. Use high level I / O library based on M PI- IO to optimize model data interface,the newsystem can support parallel output of multiple meteorological elements and data output efficiency has improved significantly. Carry out useful technical exploration and accumulation for the efficiency optimization of numerical climate model.

关 键 词：高性能计算 气候数值模式 并行I/O NETCDF 

分 类 号：TP312[自动化与计算机技术—计算机软件与理论]