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 PCFactorSetUseInPlace(PC pc)
Logically 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