dolfin team mailing list archive

[Murtazo Nazarov <murtazo@xxxxxxxxxx>]

Anders Logg wrote:
> Question #108259 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/108259
>
>     Status: Open => Answered
>
> Anders Logg proposed the following answer:
> On Sat, Apr 24, 2010 at 03:38:42AM -0000, Murtazo Nazarov wrote:
>   
> > New question #108259 on DOLFIN:
> > https://answers.launchpad.net/dolfin/+question/108259
> >
> > Hi,
> >
> > My solver was working until I recompiled dolfin for some reasons. The Petcs Krylov solver does not converges:
> >
> > Solving linear system of size 4184 x 4184 (PETSc Krylov solver).
> > terminate called after throwing an instance of 'std::runtime_error'
> >   what():  *** Error: PETSc Krylov solver did not converge (PETSc reason -4).
> >
> > However it works well with LUSolver.
> >
> > Does anyone had similar problem?
> >     
>
> Are you sure it used to converge? We recently changed a warning to an
> error, so it might be that your old solver didn't converge but you
> only thought it did.
>
>   

I checked now the output of my old solver. It converged with hypre. But, 
now it converges with LUSolver but not with Krylov solver.

I simple solve the mass matrix, after applying Dirichlet boundary 
conditions.

murtazo

> --
> Anders
>
>