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FESOM2.8 in single precision: climate fidelity over six decades and performance on CPUs and GPUs — arXiv:2611.11248

Source: arXiv (en)
Original: https://arxiv.org/abs/2611.11248
License (as archived): CC0-1.0
Archived: 2026-11-10T18:46:39.154Z
SHA-256 of the archived text: 2abe8e4285ca84e03072faca6d05684d32a56fab079cf15f9542680c743423e5
Stable URL of this page: https://metraipolis.com/documento/dc_fd736e46deb5

How to cite

FESOM2.8 in single precision: climate fidelity over six decades and performance on CPUs and GPUs — arXiv:2611.11248 — arXiv (en), https://arxiv.org/abs/2611.11248 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_fd736e46deb5 (Metraipolis archive dc_fd736e46deb5, sha256 2abe8e4285ca84e03072faca6d05684d32a56fab079cf15f9542680c743423e5)

BibTeX

@misc{dcfd736e46deb5,
  title = {FESOM2.8 in single precision: climate fidelity over six decades and performance on CPUs and GPUs — arXiv:2611.11248},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2611.11248},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_fd736e46deb5; sha256 2abe8e4285ca84e03072faca6d05684d32a56fab079cf15f9542680c743423e5},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2611.11248. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Halving the floating-point precision of an ocean model can make it substantially faster, but whether the rounding errors stay negligible over climate time scales has rarely been tested. We implement single precision in the global ocean-sea-ice model FESOM2 and compare 60-year hindcasts with double-precision controls. A first implementation lost salt steadily, accumulated a heat-content deficit of 129 ZJ, and shifted major ocean fronts. Controlled experiments trace the drift to the tracer update: small increments added to a large salinity value are rounded away, and the increments themselves are biased. Accumulating tracer tendencies and layer thicknesses in 64 bits, and carrying the rounding error of each tracer update into the next, removes the drift for at most 8% additional runtime. Single- and double-precision simulations then differ in heat content and mean state about as much as two double-precision runs with slightly perturbed initial conditions, sea ice differs by at most 0.2%, and he salinity difference is four orders of magnitude smaller than before. In the coupled model AWI-ESM3, single precision adds no detectable heat source or sink over 60 years. Single precision speeds up the 60-year hindcasts by a factor of 1.35, and the model by up to 1.66 on meshes of up to 5 km resolution; on GPUs, a C++/Kokkos version runs up to 1.27 times faster and needs 43% less memory. Whether reduced precision is safe for climate integrations is decided by long-term budgets, not by short tests.

Tema degli esploratori: calcolo e infrastrutture (elenco arXiv cs.PF, nuovi lavori del giorno).
Categorie arXiv: Atmospheric and Oceanic Physics (physics.ao-ph) ; Mathematical Software (cs.MS); Performance (cs.PF).
Pagina del lavoro: https://arxiv.org/abs/2611.11248 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-11-10T18:38:37.395Z dalla pagina https://arxiv.org/list/cs.PF/new (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).