Pré-Publication, Document De Travail Année : 2026

Mixed-Precision in adaptive Runge-Kutta method for large ODE systems

Résumé

Mixed-precision methods combine low and high precision arithmetics to exploit low precision computational speed and high precision accuracy. Large ODE systems that contain many heterogeneous interactions lead to a high computational cost that could be tackled with mixed-precision solvers. We tested mixedprecision versions of the Bogacki-Shampine 3(2) Runge-Kutta pair over three benchmark systems: coupled linear oscillators, the Kuramoto model and a circadian clock model. Our study is performed in a way that can be adapted to any finite-precision format, software architecture and numerical scheme. We found that mixed-precision solvers can preserve most of the high-precision solver accuracy under a wide range of solver tolerances. Moreover, mixed-precision solver accuracy improves with system size, reaching levels equivalent to high-precision solvers in small system size. We also observed that mixed-precision arithmetic does not impact the number of evaluation in a way that balances the benefit of fast operations in low precision. Taken together, these results show that mixed-precision methods can offer significant computational speed-up at little or no loss of accuracy in large coupled ODE systems.

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hal-05629726 , version 1 (21-05-2026)

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Mouhamad Al-Sayed, Samuel Bernard, Arsène Marzorati, Jonathan Rouzaud-Cornabas. Mixed-Precision in adaptive Runge-Kutta method for large ODE systems. 2026. ⟨hal-05629726⟩
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