On Wed, Oct 28, 2020 at 8:57 PM Sajid Ali <sajidsyed2...@u.northwestern.edu> wrote:
> Hi Matt, > > Thanks for the clarification. The documentation > <https://gitlab.com/petsc/petsc/-/blob/master/src/snes/interface/snes.c#L3304> > for SNESSetLagPreconditioner states "If -1 is used before the very first > nonlinear solve the preconditioner is still built because there is no > previous preconditioner to use" which was true prior to 3.14, is this > statement no longer valid ? > Sounds like it is not. Barry? > What is the difference between having -snes_lag_preconditioner -2 and > having -snes_lag_preconditioner_persists true ? > Persists applies to multiple solves, whereas -2 only applies to the current one. Thanks, Matt > PS : The man pages for SNESSetLagJacobianPersists should perhaps not > state the lag preconditioner options database keys and vice versa for > clarity. > > Thank You, > Sajid Ali | PhD Candidate > Applied Physics > Northwestern University > s-sajid-ali.github.io > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>
