PCPFLAREINVSetMatrixFree

Controls whether PCPFLAREINV applies its approximate inverse matrix-free

Synopsis

PetscErrorCode PCPFLAREINVSetMatrixFree(PC pc, PetscBool flg)

Logically Collective

Input Parameters

• pc - the PCPFLAREINV preconditioner context

• flg - PETSC_TRUE to apply the approximate inverse matrix-free instead of assembling it

Options Database Key

• -pc_pflareinv_matrix_free (true|false) - apply the approximate inverse matrix-free instead of assembling it; defaults to false

Note

When matrix-free the approximate inverse is applied as a sequence of matrix-vector products with the input matrix rather than as a single assembled matrix, avoiding the memory and setup cost of assembling it but making each apply more expensive. Typically the assembled matrix has a fixed sparsity pattern (which is an approximation) so applying matrix-free gives a more accurate inverse. The sai and isai types cannot be applied matrix-free.

See Also

KSP: Linear System Solvers, PCPFLAREINV, PCPFLAREINVGetMatrixFree(), PCPFLAREINVGetInverseMat()

Level

advanced

Index of all PC routines
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Index of all manual pages