fenics team mailing list archive

["Garth N. Wells" <g.n.wells@xxxxxxxxxx>]

On Mon, 2005-12-19 at 17:07 -0600, Anders Logg wrote:
> > 
> > Setting up PETSc GMRES solver: (rtol, atol, dtol, maxiter) = (1.0e-05, 1.0e-50,
> > 1.0e+04, 10000).
> > 
> > *** Error: GMRES solver did not converge. [GMRES.cpp:71: solve()]
> > 
> >  
> > 
> > My postulate would be that PETSc with the above configuration somehow gets put
> > into single precision mode and the atol=1.0e-50 doesn’t stand a change.
> > However, I can’t find this information (yet) in the PETSc log.
> > 
> >  
> > 
> > So, any known issues that explain the two issues here?
> 

At one stage, not so long ago, the preconditioner was turned off (it's
on again). This lead to a some of the demos not converging, particularly
when the mesh was refined. Could be an explanation.

Garth