John,
Sounds good. Thanks.
Dmitry.
On Thu, Oct 25, 2012 at 10:25 AM, John Peterson <
peter...@cfdlab.ae.utexas.edu> wrote:
> On Wed, Oct 24, 2012 at 6:10 PM, Dmitry Karpeev <karp...@mcs.anl.gov>
> wrote:
> > Hi All,
> >
> > I just pushed a change tweaking the nonlinear_solver API a bit: it
> allows
> > the user to provide callbacks that calculate
> > the nullspace or the near-nullspace for the system's Jacobian, which can
> be
> > used in solving a degenerate problem (e.g., using KSP)
> > or to help a suitably-equipped AMG preconditioner construct a better
> coarse
> > space, respectively. At the moment the only consumer
> > of this functionality is in Moose, but I'll try to come up with a native
> > libMesh example soon. This API change follows the pattern
> > of other similar callbacks (e.g., residual), is fully backward compatible
> > and #ifdef protected, so it's only compiled with petsc-3.3 or higher.
> > I've tested it (i.e., ran examples) with petsc-3.3 and petsc-3.2, and all
> > seems to be well, but let me know if this causes any kind of grief
> > or if there are any objections to this change.
>
> FYI, I just committed a patch that changes the name of your function
> from buildMatNullSpace() -> build_mat_null_space() to be more
> consistent with LibMesh's naming scheme, and does some reformatting.
>
> --
> John
>
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