PCAIRSetCoarseEqLimit

Sets the minimum number of global unknowns allowed on the coarsest grid of the PCAIR hierarchy

Synopsis

PETSC_EXTERN PetscErrorCode PCAIRSetCoarseEqLimit(PC pc, PetscInt input_int)

Logically Collective

Input Parameters

• pc - the PCAIR preconditioner context

• input_int - the minimum number of global unknowns allowed on the coarse grid

Options Database Key

• -pc_air_coarse_eq_limit input_int - the minimum number of global unknowns on the coarse grid; defaults to 6

Note

Coarsening continues until the coarsest grid has fewer than this many global unknowns, at which point the coarse-grid solver is applied; a smaller limit gives a deeper hierarchy with a cheaper coarse solve, while a larger limit stops coarsening sooner and leaves a larger coarse problem.

See Also

KSP: Linear System Solvers, PCAIR, PCAIRGetCoarseEqLimit(), PCAIRSetMaxLevels()

Level

advanced

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Index of all manual pages