Tells the system to do an in-place factorization. For dense matrices, this enables the solution of much larger problems. For sparse matrices the factorization cannot be done truly in-place so this does not save memory during the factorization, but after the matrix is factored, the original unfactored matrix is freed, thus recovering that space.
PetscErrorCode PETSCKSP_DLLEXPORT PCFactorSetUseInPlace(PC pc)
Collective on PC
pc -the preconditioner context
Options Database Key
-pc_factor_in_place -Activates in-place factorization
PCFactorSetUseInplace() can only be used with the KSP method KSPPREONLY or when
a different matrix is provided for the multiply and the preconditioner in
a call to KSPSetOperators().
This is because the Krylov space methods require an application of the
matrix multiplication, which is not possible here because the matrix has
been factored in-place, replacing the original matrix.
PC, set, factorization, direct, inplace, in-place, LU
Index of all PC routines
Table of Contents for all manual pages
Index of all manual pages