> > It does not. And I should have mentioned earlier, that I tried -snes_mf, - > > snes_mf_operator, -snes_fd and -snes_fd_color already and none of those > > converges. Your suggested options result in > > For solver questions, I always need to see the result of > > -snes_view -snes_monitor -ksp_converged_reason -ksp_monitor_true_residual > -snes_converged_reason > > Turn on LU for the linear solver so it plays no role.
I'm not sure what you mean by the last sentence, but I ran with -pc_type lu and the other options you suggested. Output is in http://paste.debian.net/688191/ I don't see anything wrong in it except it does not converge. :) And it settles in a weird oscillatory solution (looks almost like a sin()) whereas the real solution is 4*arctan(exp(x)). Thanks for your help. Cheers, Juha
