[petsc-users] Pre-check before each line search function evaluation

[Barry Smith]

  Why is this all not part of the function evaluation?


> On Nov 30, 2023, at 3:25 PM, Alexander Lindsay <alexlindsay239 at gmail.com> wrote:
> 
> Hi I'm looking at the sources, and I believe the answer is no, but is there a dedicated callback that is akin to SNESLineSearchPrecheck but is called before *each* function evaluation in a line search method? I am using a Hybridized Discontinuous Galerkin method in which most of the degrees of freedom are eliminated from the global system. However, an accurate function evaluation requires that an update to the "global" dofs also trigger an update to the eliminated dofs.
> 
> I can almost certainly do this manually but I believe it would be more prone to error than a dedicated callback.