Contribution to a conference proceedings/Contribution to a book

FZJ-2025-05554

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Computing the Full Earth System at 1km Resolution

Klocke, D. (Corresponding author) ; Frauen, C. ; Engels, J. F. ; Alexeev, D. ; Redler, R. ; Schnur, R. ; Haak, H. ; Kornblueh, L. ; Brüggemann, N. ; Chegini, F. ; Römmer, M.FZJ* ; Hoffmann, L.FZJ* ; Griessbach, S.FZJ* ; Bode, M.FZJ* ; Coles, J. ; Gila, M. ; Sawyer, W. ; Calotoiu, A. ; Budanaz, Y. ; Mazumder, P. ; Copik, M. ; Weber, B. ; Herten, A.FZJ* ; Bockelmann, H. ; Hoefler, T. ; Hohenegger, C. ; Stevens, B.

2025
ACM New York, NY, USA New York, NY, USA

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Please use a persistent id in citations: doi:10.1145/3712285.3771789

Abstract: We present the first-ever global simulation of the full Earth system at 1.25 km grid spacing, achieving highest time compression with an unseen number of degrees of freedom. Our model captures the flow of energy, water, and carbon through key components of the Earth system: atmosphere, ocean, and land. To achieve this landmark simulation, we harness the power of 8192 GPUs on Alps and 20480 GPUs on JUPITER, two of the world’s largest GH200 superchip installations. We use both the Grace CPUs and Hopper GPUs by carefully balancing Earth’s components in a heterogeneous setup and optimizing acceleration techniques available in ICON’s codebase. We show how separation of concerns can reduce the code complexity by half while increasing performance and portability. Our achieved time compression of 145.7 simulated days per day enables long studies including full interactions in the Earth system and even outperforms earlier atmosphere-only simulations at a similar resolution.

Note: arXiv version: https://arxiv.org/abs/2511.02021

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)

Research Program(s):

1. 5122 - Future Computing & Big Data Systems (POF4-512) (POF4-512)
2. 5112 - Cross-Domain Algorithms, Tools, Methods Labs (ATMLs) and Research Groups (POF4-511) (POF4-511)
3. 5111 - Domain-Specific Simulation & Data Life Cycle Labs (SDLs) and Research Groups (POF4-511) (POF4-511)
4. ATML-X-DEV - ATML Accelerating Devices (ATML-X-DEV) (ATML-X-DEV)
5. BMFTR 01LK2316A - Warmworld Smarter (IconRep) (-01LK2316A) (-01LK2316A)
6. BMBF 01LK2204D - WarmWorld Modul 3 "Easier" (BMBF-01LK2204D) (BMBF-01LK2204D)

Appears in the scientific report 2025

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