[petsc-users] set block size on AMG systems

[Jed Brown]

http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MatSetBlockSize.html

PCML, PCHYPRE, and PCGAMG pay attention to this parameter if no richer
information (like near-null spaces) is provided.

For complex-valued problems, you're likely better off using complex numbers.


On Sat, Mar 23, 2013 at 2:25 PM, Nico Schlömer <nico.schloemer at gmail.com>wrote:

> Hi,
>
> I've got this linear system consisting of 2x2 blocks (acutally coming
> from a real-imaginary formulation of a complex-valued problem) and I'd
> like to precondition the linear solves with AMG. Things are already
> working well when taking the defaults, but I guess one could achieve
> way better when telling AMG about the 2x2 structure. Trilinos' ML does
> this by a parameter "PDE equations". -- Is there something comparable
> in the PETSc world?
>
> --Nico
>
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