Preconditioner
Preconditioner
Section SCF::Eigensolver
Type integer
Which preconditioner to use in order to solve the Kohn-Sham
equations or the linear-response equations. The default is
pre_filter, except for curvilinear coordinates, where no
preconditioner is applied by default.
Options:
- no:
Do not apply preconditioner.
- pre_filter:
Filter preconditioner.
- pre_jacobi:
Jacobi preconditioner. Only the local part of the pseudopotential is used.
Not very helpful.
- pre_poisson:
Uses the full Laplacian as preconditioner. The inverse is calculated through
the solution of the Poisson equation. This is, of course, very slow.
- pre_multigrid:
Multigrid preconditioner.