Solver options: fallback observability, tolerance ownership, the single-field FMG unlock, and multiplier_schur_pc verified (#478 #483 #484 #486) - #534

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lmoresi merged 5 commits into

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bugfix/solver-options-bundle

Aug 12, 2026

Commits on Aug 12, 2026

Make every preconditioner fallback readable: solver.pc_fallbacks records what degraded, where, and why (#484)
lmoresi
committed
e5ce493
Honour user-set snes_rtol/ksp_atol on the saddle-point solvers, and derive tolerance margins through one documented mechanism (#483)
lmoresi
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9611058
Honour explicit geometric multigrid on single-field solvers via injection-free custom-P transfers (#478)
lmoresi
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999dbc6
multiplier_schur_pc: prove where it is live, instrument where it is inert, correct the drifted docstrings (#486)
lmoresi
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44e483b
Review response: a resolution-cached hierarchy yields to a new explicit choice; the inertness probe reads the flag's value
lmoresi
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45acc08