[petsc-users] DIVERGED_LS_FAILURE

[Rebecca Xuefei Yuan]

Dear all,

I have the convergence history as



   0 SNES Function norm 1.930639214656e-14
     0 KSP Residual norm 1.930639214656e-14
     1 KSP Residual norm 1.897969082784e-14
     2 KSP Residual norm 1.890943705731e-14
     3 KSP Residual norm 1.890499250642e-14
     4 KSP Residual norm 1.882719263807e-14
     5 KSP Residual norm 1.881639616800e-14
     6 KSP Residual norm 1.881624492545e-14
     7 KSP Residual norm 1.876497311488e-14
     8 KSP Residual norm 1.864714377471e-14
     9 KSP Residual norm 1.861061216430e-14
    10 KSP Residual norm 1.856993815540e-14
    11 KSP Residual norm 1.856245191617e-14
    12 KSP Residual norm 1.855993722295e-14
    13 KSP Residual norm 1.855756795426e-14
    14 KSP Residual norm 1.855542358114e-14
    15 KSP Residual norm 1.855188622531e-14
    16 KSP Residual norm 1.854906019037e-14
    17 KSP Residual norm 1.851397858397e-14
    18 KSP Residual norm 1.851152033377e-14
    19 KSP Residual norm 1.845662066987e-14
    20 KSP Residual norm 1.810881990601e-14
    21 KSP Residual norm 9.715701270773e-15
    22 KSP Residual norm 2.134473951854e-15
Linear solve converged due to CONVERGED_RTOL iterations 22
Nonlinear solve did not converge due to DIVERGED_LS_FAILURE

Why the linear solver is failed?

Thanks a lot!





Rebecca Xuefei YUAN
Department of Applied Physics and Applied Mathematics
Columbia University
Tel:917-399-8032
www.columbia.edu/~xy2102