[petsc-users] default preconditioner

[Jed Brown]

On Tue, 23 Feb 2010 10:04:46 -0000, "Christian Klettner" <christian.klettner at ucl.ac.uk> wrote:
> Dear PETSc,
> What is the default preconditioner (if i do not explicitly set one)?

Short answer: Run with -ksp_view.

Long answer: ILU(0) in serial and block Jacobi with ILU(0) on subdomains
in parallel, unless using DMMG in which case it is full multigrid with
the above on each level (wrapped in a single GMRES iteration) and a
redundant coarse level solve.

Jed