Fidelity guide

Runtimes are per segment (one SLURM job) with the sweep t_end of ~35–98 nondim units.

Fidelity	Grid	4 CPUs	16 CPUs	Use for
3	8×8	seconds	—	Smoke tests, CI
4	16×16	~2 min	—	Quick debugging
5	32×32	~2 min	~1 min	BO DoE, low-fidelity surrogate
6	64×64	~15 min	~5 min	Mid-fidelity check
7	128×128	~2 h	~30 min	Standard production sweeps
8	256×256	~16 h (approx.)	~4 h (approx.)	Grid-convergence check vs. fidelity 7
9	512×512	~days	~10–11 h/condition (measured)	High-fidelity reference
10	1024×1024	—	~2.7–6.6 days/condition (measured)	Publication (Kim et al. 2024/2025)

Specify "cpus": 16 in _sweep when using fidelity ≥ 7.

For which level to actually pick, see How to choose a fidelity level.