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Version 0.2.2 #50
Description
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Release notes:
p-multigrid preconditioner for MatrixFreeSolver (new API, nothing breaking).
PMultigrid(spaces; smoother = Chebyshev(), coarse, coarse_every): one symmetric V-cycle per Krylov iteration on nested Lagrangian levels of the same mesh (Q2 → Q1, Q3 → Q1, Q3 → Q2 → Q1). Matrix-free on the working order, assembled coarse level with its own solver (e.g. one GAMG V-cycle). Coarse operators rediscretised from the Newton's forms at the injected state; the levels follow load steps (update) and HyperFEM's Dirichlet projection.Chebyshev(; degree = 2, range = 20)smoother, preconditioned by the nodal block diagonal, with a reproducible Ritz estimate of λmax.- Transfers:
Prolongation,prolongate!,restrict!(exact transpose),inject!. - Nodal blocks computed from the stored point tangents (×3.5 cheaper; also used by
BlockJacobi). - New hook
preconditioner_ok: a non-finite tangent, a singular nodal block or an indefinite tangent makes the linear solve fail at once, so the Newton cuts back. - Measured on a unit cube (Mac M5 Max, 6 threads, PETSc serial): ×8.3 per Newton iteration at 957k dofs Q2 and ×19 at 227k Q3 against CG + GAMG on the assembled tangent, with ~4× less memory; Krylov iterations nearly mesh-independent (25 → 28).
Activity
JuliaRegistrator commentedon Nov 8, 2026
Registration pull request created: JuliaRegistries/General/175337
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jmartfrut commentedon Nov 8, 2026
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JuliaRegistrator commentedon Nov 8, 2026
Registration pull request updated: JuliaRegistries/General/175337
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