Hello everyone, at the moment I'm trying to solve a Poisson problem with SIPG stabilization and discontinuous finite elements. The matrix is constructed in deal.II. When I try to solve this problem with PETSc's CG solver and a BlockJacobi preconditioner or a BoomerAMG preconditioner from the Hypre package I get this weird error message.
Exception on processing: Iterative method reported convergence failure in step 3 with residual 1.50616 Aborting! Since the solver is allowed to take 5000 steps this convergence failure is clearly early. Did anyone encounter such an error before? What can produce such an early convergence failure? Thanks in advance, Daniel
