Hi, I updated petsc from 3.2 to 3.4. However, I found that the nonlinear solver previously worked well now failed with massage DIVERGED_LINE_SEARCH. My problem is extremely nonlinear, cubic line search may fail but Newton method works. With petsc 3.2, I only use basic Newton by calling SNESLineSearchSet(snes, SNESLineSearchNo, PETSC_NULL) With 3.4 I call basic Newton by SNESLineSearchSetType(snes, SNESLINESEARCHBASIC).
However, petsc 3.4 still reports [0] SNESSolve_NEWTONLS(): fnorm=3.7500000000000006e-02, gnorm=3.7500000000000006e-02, ynorm=1.0000000000000000e+00, lssucceed=0 [0] SNESNEWTONLSCheckLocalMin_Private(): || J^T F|| 1.414213562373e+00 near zero implies found a local minimum It seems petsc 3.4 can not disable line search. Does anyone have the same problem? Gong Ding
