[petsc-users] Possible to recover ILU(k) from hypre/pilut?

[Smith, Barry F.]

> On Nov 15, 2017, at 6:38 AM, Mark Lohry <mlohry at gmail.com> wrote:
> 
> I've found ILU(0) or (1) to be working well for my problem, but the petsc implementation is serial only. Running with -pc_type hypre -pc_hypre_type pilut with default settings has considerably worse convergence. I've tried using -pc_hypre_pilut_factorrowsize (number of actual elements in row) to trick it into doing ILU(0), to no effect.
> 
> Is there any way to recover classical ILU(k) from pilut?
> 
> Hypre's docs state pilut is no longer supported, and Euclid should be used for anything moving forward. pc_hypre_boomeramg has options for Euclid smoothers. Any hope of a pc_hypre_type euclid?

  Not unless someone outside the PETSc team decides to put it back in. 
> 
> 
> Partially unrelated, PC block-jacobi fails with MFFD type not supported, but additive schwarz with 0 overlap, which I think is identical, works fine. Is this a bug?

   Huh, is this related to hypre, or plan PETSc? Please send all information, command line options etc that reproduce the problem, preferably on a PETSc example.

   Barry

> 
> 
> Thanks,
> Mark