> On 29 Jul 2015, at 17:26, Justin Chang <jychang48@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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