[petsc-users] Meaning of PETSc error code 77

[Justin Chang]

 Hi Aditya,

I wouldn't trust FEniCS' wrappers around PETSc. It might also depend on the
version of DOLFIN you're working with.

Shameless plug: Try using pfibs

https://github.com/NREL/pfibs

 We wrote a slightly better PETSc interface to FEniCS. It does require
FEniCS 2018.1.0 or higher. This should at least give better error logs for
your problem.

Also I know a lot of PETSc solvers rely on some sort of DM, which FEniCS
(at the moment) does not automatically provide. We have a pFibs branch
which attaches a DMShell to your functionspace.

https://github.com/NREL/pfibs/tree/dm-nested-solver-feature

It's still in its early stages, but it should at least be able to handle
the PETScOptions you've set above.

Hopefully this helps,
Justin

On Fri, Feb 8, 2019 at 10:41 AM aditya kumar via petsc-users <
petsc-users at mcs.anl.gov> wrote:

> Hello,
>
> I am using PETSc with FEniCS project libraries to solve a nonlinear
> problem. I am using PETSc Krylov solver with the following configuration
>
> pc = PETScPreconditioner("petsc_amg")
> PETScOptions.set("mg_levels_ksp_type", "chebyshev")
> PETScOptions.set("mg_levels_pc_type", "jacobi")
> PETScOptions.set("mg_levels_esteig_ksp_type", "cg")
> PETScOptions.set("mg_levels_ksp_chebyshev_esteig_steps", 50) solver_u =
> PETScKrylovSolver("cg", pc)
>
> I am encountering this error sometimes during the solution of the linear
> system:
> Error: Unable to successfully call PETSc function 'KSPSolve'. *** Reason:
> PETSc error code is: 77 (Petsc has generated inconsistent data). *** Where:
> This error was encountered inside
> /tmp/dolfin/dolfin/la/PETScKrylovSolver.cpp.
>
> *** Process: 130
>
> Can anybody help me in understanding the possible reasons for this error
> code? Or refer me to any available documentation? It will be really
> helpful.
>
> Also, I will like to know if there is a way to prevent the code from
> stopping due to such PETSc errors, so that I can tweak some parameters to
> hopefully make it progress.
>
> Thanks and Regards,
> Aditya
>
>
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