[firedrake] Multi-grid preconditioning

[Justin Chang]

Okay I will give this a try, thanks!

On Wed, Jul 29, 2015 at 2:13 PM, Lawrence Mitchell <
lawrence.mitchell at imperial.ac.uk> wrote:

>
>
> > On 29 Jul 2015, at 17:26, Justin Chang <jychang48 at gmail.com> wrote:
> >
> > Is there support for Multi-grid preconditioning? I think I saw somewhere
> where this was not supported yet. Because applying -pc_type gamg for my
> mixed forms returns me errors.
>
> If you want to apply AMG to your mixed form, you'll need to assemble a
> monolithic matrix. Pass nest=False when either assembling the operator or
> building your solver.
>
> However, this may not work well, you might want to do gamg on one of the
> blocks, using fieldsplit preconditioners: all the normal PETSc options work.
>
> Lawrence
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