2022
DOI: 10.5194/gmd-15-3753-2022
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A scalability study of the Ice-sheet and Sea-level System Model (ISSM, version 4.18)

Abstract: Abstract. Accurately modelling the contribution of Greenland and Antarctica to sea level rise requires solving partial differential equations at a high spatial resolution. In this paper, we discuss the scaling of the Ice-sheet and Sea-level System Model (ISSM) applied to the Greenland Ice Sheet with horizontal grid resolutions varying between 10 and 0.25 km. The model setup used as benchmark problem comprises a variety of modules with different levels of complexity and computational demands. The core builds th… Show more

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Cited by 8 publications
(8 citation statements)
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“…Indeed, many models (e.g. Leng and others, 2012;Brown and others, 2013;Isaac and others, 2015;Tuminaro and others, 2016;Fischler and others, 2022) also show good parallel scaling, something not addressed here.…”
Section: DXmentioning
confidence: 84%
See 2 more Smart Citations
“…Indeed, many models (e.g. Leng and others, 2012;Brown and others, 2013;Isaac and others, 2015;Tuminaro and others, 2016;Fischler and others, 2022) also show good parallel scaling, something not addressed here.…”
Section: DXmentioning
confidence: 84%
“…Some hybrid schemes apply the pessimistic paradigm as an adaptive restriction (Winkelmann and others, 2011) across all spatial scales. Other models apparently require the user to choose a fixed time step through trial and error in some circumstances (Fischler and others, 2022; Robinson and others, 2022, e.g.). The optimistic paradigm has theoretical support for a certain higher-order DIVA scheme (Robinson and others, 2022, Equation (52)), but practical Greenland simulations in the same work actually suggest an intermediate power Δ t ≈ O (Δ x 1.6 ) (Robinson and others, 2022, Figure 3(a)).…”
Section: Performance Analysismentioning
confidence: 99%
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“…For this endeavour, it is worth comparing the computational costs of the ice sheet and hydrology models. Comparing the SYPD for a Greenland setup in the ice sheet model in the highest tested resolution (G250) presented in (Fischler et al, 2022) with the G150 resolution of CUAS-MPI, we find that the computional costs are comparable for both models. As a consequence, both simulations would need the same time per year, which which is preferable for achieving low idle time at synchronization points in coupled runs.…”
Section: Discussionmentioning
confidence: 94%
“…The computational component of the hybrid "SSA+SIA" model in PISM is found to scale well on up to 1024 cores in [17] but the I/O component is found to scale poorly. In [21], low-overhead performance instrumentation is developed for the "Blatter-Pattyn" model in ISSM and good scaling is found on up to 3072 cores. The study finds that matrix assembly and I/O begins to scale poorly and highlights the importance of continuous performance monitoring.…”
Section: Previous Related Workmentioning
confidence: 99%