What does -ksp_monitor_true_residual show? On Fri, May 15, 2015 at 1:45 PM Fande Kong <[email protected]> wrote:
> Hi all, > > I was wondering why we will get a zero residual when solving the linear > step of a nonlinear problem? I am solving a fluid-structure interaction > problems using inexact Newton method, within which fGMRES is used together > with a multilevel Schwarz preconditioner. The algorithm works well when the > mesh is small, but it catched a zero residual issue when we turn to use a > little bit large mesh. The output is listed as follows: > > 0 SNES Function norm 1.291775443677e-02 > Jacobian: rows 5575441 Column 5575441 > call DMGetInterpolation_SpmcsDMMesh > Jacobian: rows 1298448 Column 1298448 > 0 KSP Residual norm 1.291775443677e-02 > 1 KSP Residual norm 0.000000000000e+00 > Nonlinear solve did not converge due to DIVERGED_LINE_SEARCH iterations 0 > > > Any suggestions? Thanks. > > Fande, > > > >
