Hugo Gagnon <opensource.petsc at user.fastmail.fm> writes: > Hi, > > I have a problem that converges fine in sequential mode but diverges > in MPI (other problems seem to converge fine for both modes). I am no > expert in parallel solvers but, is this something I should expect? > I'm using BiCGSTAB with BJACOBI ILU(3). Perhaps I'm overseeing some > parameters that could improve my convergences?
The most common problem is that you assemble a different operator in parallel. So check that and check that you get the same answer when using redundant solves. -pc_type redundant -redundant_pc_type ilu
