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
