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© 2020. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.

Abstract

With semiconductor technology gradually approaching its physical and thermal limits, recent supercomputers have adopted major architectural changes to continue increasing the performance through more power-efficient heterogeneous many-core systems. Examples include Sunway TaihuLight that has four management processing elements (MPEs) and 256 computing processing elements (CPEs) inside one processor and Summit that has two central processing units (CPUs) and six graphics processing units (GPUs) inside one node. Meanwhile, current high-resolution Earth system models that desperately require more computing power generally consist of millions of lines of legacy code developed for traditional homogeneous multicore processors and cannot automatically benefit from the advancement of supercomputer hardware. As a result, refactoring and optimizing the legacy models for new architectures become key challenges along the road of taking advantage of greener and faster supercomputers, providing better support for the global climate research community and contributing to the long-lasting societal task of addressing long-term climate change. This article reports the efforts of a large group in the International Laboratory for High-Resolution Earth System Prediction (iHESP) that was established by the cooperation of Qingdao Pilot National Laboratory for Marine Science and Technology (QNLM), Texas A&M University (TAMU), and the National Center for Atmospheric Research (NCAR), with the goal of enabling highly efficient simulations of the high-resolution (25 km atmosphere and 10 km ocean) Community Earth System Model (CESM-HR) on Sunway TaihuLight. The refactoring and optimizing efforts have improved the simulation speed of CESM-HR from 1 SYPD (simulation years per day) to 3.4 SYPD (with output disabled) and supported several hundred years of pre-industrial control simulations. With further strategies on deeper refactoring and optimizing for remaining computing hotspots, as well as redesigning architecture-oriented algorithms, we expect an equivalent or even better efficiency to be gained on the new platform than traditional homogeneous CPU platforms. The refactoring and optimizing processes detailed in this paper on the Sunway system should have implications for similar efforts on other heterogeneous many-core systems such as GPU-based high-performance computing (HPC) systems.

Details

Title
Optimizing high-resolution Community Earth System Model on a heterogeneous many-core supercomputing platform
Author
Zhang, Shaoqing 1 ; Fu, Haohuan 2 ; Wu, Lixin 3 ; Li, Yuxuan 4 ; Wang, Hong 1 ; Zeng, Yunhui 5 ; Duan, Xiaohui 6 ; Wan, Wubing 7 ; Wang, Li 5 ; Zhuang, Yuan 5 ; Meng, Hongsong 7 ; Xu, Kai 6 ; Xu, Ping 8 ; Gan, Lin 8 ; Liu, Zhao 8 ; Wu, Sihai 7 ; Chen, Yuhu 9 ; Yu, Haining 7 ; Shi, Shupeng 7 ; Wang, Lanning 10 ; Xu, Shiming 11   VIAFID ORCID Logo  ; Xue, Wei 8 ; Liu, Weiguo 6 ; Guo, Qiang 5 ; Zhang, Jie 5 ; Zhu, Guanghui 5 ; Tu, Yang 5 ; Edwards, Jim 12 ; Baker, Allison 12   VIAFID ORCID Logo  ; Yong, Jianlin 13 ; Yuan, Man 13   VIAFID ORCID Logo  ; Yu, Yangyang 13 ; Zhang, Qiuying 14 ; Liu, Zedong 9 ; Li, Mingkui 1 ; Jia, Dongning 9 ; Yang, Guangwen 15 ; Wei, Zhiqiang 9 ; Pan, Jingshan 5 ; Chang, Ping 14 ; Danabasoglu, Gokhan 12 ; Yeager, Stephen 12 ; Rosenbloom, Nan 12   VIAFID ORCID Logo  ; Guo, Ying 5 

 International Laboratory for High-Resolution Earth System Model and Prediction (iHESP), Qingdao, China; Laboratory for Ocean Dynamics and Climate, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, China; Key Laboratory of Physical Oceanography, Institute for Advanced Ocean Study, Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES), College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China 
 Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China; National Supercomputing Center in Wuxi, Wuxi, China; International Laboratory for High-Resolution Earth System Model and Prediction (iHESP), Qingdao, China 
 Laboratory for Ocean Dynamics and Climate, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, China; Key Laboratory of Physical Oceanography, Institute for Advanced Ocean Study, Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES), College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China 
 Department of Computer Science and Technology, Tsinghua University, Beijing, China 
 Computer Science Center & National Supercomputer Center in Jinan, Jinan, China 
 National Supercomputing Center in Wuxi, Wuxi, China; School of Software, Shandong University, Jinan, China 
 National Supercomputing Center in Wuxi, Wuxi, China 
 National Supercomputing Center in Wuxi, Wuxi, China; Department of Computer Science and Technology, Tsinghua University, Beijing, China 
 Department of Supercomputing, Qingdao Pilot National Laboratory for Marine Science and Technology, Qingdao, China 
10  National Supercomputing Center in Wuxi, Wuxi, China; College of Global Change and Earth System Science, Beijing Normal University, Beijing, China 
11  Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China 
12  International Laboratory for High-Resolution Earth System Model and Prediction (iHESP), Qingdao, China; National Center for Atmospheric Research, Boulder, Colorado, USA 
13  Key Laboratory of Physical Oceanography, Institute for Advanced Ocean Study, Frontiers Science Center for Deep Ocean Multispheres and Earth System (FDOMES), College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China 
14  International Laboratory for High-Resolution Earth System Model and Prediction (iHESP), Qingdao, China; Department of Oceanography, Texas A&M University, College Station, Texas, USA 
15  International Laboratory for High-Resolution Earth System Model and Prediction (iHESP), Qingdao, China; National Supercomputing Center in Wuxi, Wuxi, China; Department of Computer Science and Technology, Tsinghua University, Beijing, China 
Pages
4809-4829
Publication year
2020
Publication date
2020
Publisher
Copernicus GmbH
ISSN
1991962X
e-ISSN
19919603
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2449066401
Copyright
© 2020. This work is published under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.