CAJ | 학술논문

全球变暖导致自然灾害频度和强度都有所增加，发展高精度地球系统模式，对防灾减灾、促进经济发展有重要意义。随模式分辨率提高，地球系统模式的I/O性能正逐渐成为制约模式可扩展性和计算效率的瓶颈。本文针对地球系统模式的I/O问题，以代表性的海洋环流模式LICOM2为研究对象，全面分析了地球系统模式的典型I/O特点，研究通用的高并发I/O技术。本文设计实现了LICOM2系统的ADIOS并行读写方案，都取得了显著的优化效果。LICOM2系统ADIOS优化在天河1A系统内网测试，在288-6480并行度下I/O时间占比均不到4%，在6480并行度下写带宽达8.46GB/s。本文通过在天河1A上的大量测试，对提高LICOM2系统的I/O性能做了进一步的研究，不同系统配置会对I/O性能有影响。
전구변난도치자연재해빈도화강도도유소증가，발전고정도지구계통모식，대방재감재、촉진경제발전유중요의의。수모식분변솔제고，지구계통모식적I/O성능정축점성위제약모식가확전성화계산효솔적병경。본문침대지구계통모식적I/O문제，이대표성적해양배류모식LICOM2위연구대상，전면분석료지구계통모식적전형I/O특점，연구통용적고병발I/O기술。본문설계실현료LICOM2계통적ADIOS병행독사방안，도취득료현저적우화효과。LICOM2계통ADIOS우화재천하1A계통내망측시，재288-6480병행도하I/O시간점비균불도4%，재6480병행도하사대관체8.46GB/s。본문통과재천하1A상적대량측시，대제고LICOM2계통적I/O성능주료진일보적연구，불동계통배치회대I/O성능유영향。
With the global warming, natural disasters have happened more frequently and severely. It is critical to foster the research and development of the earth system model, which helps disaster prevention and economic development. As the forecast model requires higher resolution, the I/O performance has become the bottleneck of computation scalability and efifciency for the earth system model. We use the global ocean circulation model LICOM2 as a typical case, to comprehensively analyse its I/O features and ifnd out the high performance I/O techniques for the earth system model. We have implemented the parallel I/O modules of LICOM2 by using ADIOS, which has achieved good I/O performance improvement. The I/O time of LICOM2 based on ADIOS is no more than 4%of total time with 288-6480 cores on the Tianhe-1A system. Its write bandwidth is up to 8.46GB/s on 6480 cores. we have made large amounts of tests on the Tianhe-1A system to further research on improving the I/O performance, to ifnd out that different system settings have inlfuence on the I/O performance.