The first time you run OpenIFS in single precision, the global CO₂ mass budget will look like it has a severe leak. Here is what we found after tracking the diagnostics term-by-term, why >99.5% of the drift is chaotic weather, and how stochastic rounding fixed the real numerical error.
We’ve all watched a 64-node Slurm job stall for three minutes just importing xarray. Here is why standard Conda environments choke parallel filesystems like Lustre, and how pairing Astral uv with system LMOD modules eliminates job startup lag on MareNostrum 5.
When Till Muser shared Flowers—a neural PDE solver built entirely from multihead coordinate warps without Fourier multipliers or attention—it immediately resonated with our CFD background. Here is our experience discovering and benchmarking Flowers on the 2D Shallow Water Equations from PDEBench.
Engineering lessons from managing multi-member Earth system model ensembles on MareNostrum 5: orchestrating DAGs with Autosubmit, tuning Lustre striping for NetCDF outputs, and NUMA-aware MPI rank placement.