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DOE OSTI · 1963136

Towards Ultra-high-resolution E3SM Land Modeling on Exascale Computers

Wang, Dali·Schwartz, Peter·Yuan, Fengming·Thornton, Peter·Zheng, Weijian
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Abstract

Here we present an ultra-high-resolution E3SM land model (uELM) for high-fidelity land simulations targeting new Exascale computers. After considering modeling infrastructure compatibility and ELM software features, we designed a parallel model for the uELM development targeting hybrid architectures of new US Exascale computers. We also described a function unit test framework to expedite the piece-wise code porting (with compiler directives), verification, and global variable management. Furthermore, in this study, we report an early uELM model development using OpenACC within a function unit test framework on a pre-Exascale computer, demonstrate the performance of a uLEM submodel with a 3.0-time speedup, and summarize the code porting experience regarding global variable handling, deepcopy, memory reduction, and parallel loop reconstruction.

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97 MATHEMATICS AND COMPUTINGE3SM land modelExascale computingcompiler directiveearth system modelsfunction unit testingscientific software engineeringultra-high-resolution land simulation

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Wang, Dali, Schwartz, Peter, Yuan, Fengming, Thornton, Peter, Zheng, Weijian. 2022-11-02. Towards Ultra-high-resolution E3SM Land Modeling on Exascale Computers. https://doi.org/10.1109/mcse.2022.3218990

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