unable to change SNES max iteration

[bknight1]

Do we want the user to be able to adjust the max number of iterations or always limit solves to 50?

underworld3/src/underworld3/cython/petsc_generic_snes_solvers.pyx

Line 2590 in 32a3e02

snes_max_it = 50

[lmoresi]

OK - so this one was my decision. The flag to use Picard for a few iterations just makes the coding awkward. I guess we have to think about whether the solution here is brute force (bash on through) or mathematical elegance (figure out why convergence is poor and fix that).

[knepley]

You can get the "Picard for a few iterations behavior" with command line options, using nonlinear preconditioning. We should definitely write that up since it is easy and generally useful.