dolfin team mailing list archive

["Garth N. Wells" <gnw20@xxxxxxxxx>]

On Wed, 2010-07-21 at 18:24 +0200, Florian Rathgeber wrote:
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> Hi,
> 
> I just noticed that the convergence of the PETSc Krylov solvers declined
> rapidly since rev 4832 (before the big interface change). Attached are 2
> runs of the same demo, for 4832 and 4863. The computed solution is
> obviously the same. My guess is something is wrong with the
> preconditioner. Or do I need to change any of the newly introduced
> parameters (reuse_preconditioner, same_nonzero_pattern)?
> 

You probably need to use the new parameter

  "nonzero_initial_guess"

It's set to false by default.

Garth


> Florian
> 
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