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

Smith, Barry F. bsmith at mcs.anl.gov
Wed Nov 15 21:50:00 CST 2017

> On Nov 15, 2017, at 9:40 PM, Jed Brown <jed at jedbrown.org> wrote:
> "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.

   The hypre team now claims they care about Euclid. But given the limitations of ILU in parallel I can't imagine anyone cares all that much.

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