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

[Jed Brown]

"Smith, Barry F." <bsmith at mcs.anl.gov> writes:

>> 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. 

PETSc used to have a Euclid interface.  My recollection is that Barry
removed it because users were finding too many bugs in Euclid and
upstream wasn't fixing them.  A contributed revival of the interface
won't fix the upstream problem.