Developing and redesigning astrophysical, cosmological, and space plasma numerical codes for existing and next-generation accelerators is critical for enabling large-scale simulations. To address these challenges, the SPACE Center of Excellence (SPACE-CoE) fosters collaboration between scientists, code developers, and high-performance computing experts to optimize applications for the exascale era. This paper presents our strategy and initial results on the Leonardo system at CINECA for three flagship codes, namely gPLUTO, OpenGadget3 and iPIC3D, using profiling tools to analyze performance on single and multiple nodes. Preliminary tests show all three codes scale efficiently, reaching 80% scalability up to 1,024 GPUs.
@article{arxiv.2510.24175,
title = {Towards Exascale Computing for Astrophysical Simulation Leveraging the Leonardo EuroHPC System},
author = {Nitin Shukla and Alessandro Romeo and Caterina Caravita and Michael Redenti and Radim Vavrik and Lubomir Riha and Andrea Mignone and Marco Rossazza and Stefano Truzzi and Luca Tornatore and Antonio Ragagnin and Tiago Castro and Geray S. Karademir and Klaus Dolag and Pranab J. Deka and Fabio Bacchini and Rostislav-Paul Wilhelm and Daniele Gregori and Elisabetta Boella},
journal= {arXiv preprint arXiv:2510.24175},
year = {2025}
}