[petsc-users] Behaviour of Newton Methods with Direct Solvers.

[subramanya sadasiva]

Hi, 
Is there a reason that the convergence of the newton methods in SNES is much 
better with iterative solvers instead of with direct solvers? This is 
particularly in reference with the VI solvers. I get nearly quadratic 
convergence with the iterative solvers, but the code just diverges or converges 
linearly when i run with  -ksp_type preonly .Thanks, Subramanya