Mark Adams <[email protected]> writes: > Oh, Maybe the Jacobian has Nans or Infs even though the last time step > survived. Maybe it was going crazy. I'll check
If that is the case you would use TSSetFunctionDomainError(). > On Wed, Nov 1, 2017 at 2:13 PM, Mark Adams <[email protected]> wrote: > >> Yea, I don't understand the linear solve error: >> >> -ts_monitor -ts_type beuler -pc_type lu -pc_factor_mat_solver_package >> mumps -ksp_type preonly -snes_monitor -snes_rtol 1.e-10 -snes_stol 1.e-10 >> -snes_converged_reason -snes_atol 1.e-18 -snes_converged_reason >> >> Maybe mumps? >> >> On Wed, Nov 1, 2017 at 2:02 PM, Jed Brown <[email protected]> wrote: >> >>> Mark Adams <[email protected]> writes: >>> >>> > On Wed, Nov 1, 2017 at 1:46 PM, Jed Brown <[email protected]> wrote: >>> > >>> >> Mark Adams <[email protected]> writes: >>> >> >>> >> > I have added some code in a TS post step method to look at the >>> number of >>> >> > nonlinear iterations and cut the time step if it took too many SNES >>> >> > iterations. That helped but now I want to go one step further and >>> >> recover >>> >> > from a failed time step (see appended error message). >>> >> > >>> >> > How can/should I recover from a SNES failure inside of TS? I could >>> just >>> >> put >>> >> > TSSolve in a loop and if TS failed because of the solver, then >>> reduce the >>> >> > time step and try to recover the state, and try again. >>> >> > >>> >> > Thoughts? >>> >> > >>> >> > Thanks, >>> >> > Mark >>> >> > >>> >> > Note, this is a direct solver and the linear solver is diverging? >>> I've >>> >> > seen the same thing with the maximum its in SNES and failed >>> linesearch. >>> >> > >>> >> > 23 TS dt 0.0025 time 0.1025 >>> >> > 0 SNES Function norm 9.997473571601e+04 >>> >> > 1 SNES Function norm 2.295851692533e-01 >>> >> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> >> iterations 1 >>> >> > [0]PETSC ERROR: --------------------- Error Message >>> >> > -------------------------------------------------------------- >>> >> > [0]PETSC ERROR: >>> >> > [0]PETSC ERROR: TSStep has failed due to DIVERGED_NONLINEAR_SOLVE, >>> >> increase >>> >> > -ts_max_snes_failures or make negative to attempt recovery >>> >> >>> >> Did you increase -ts_max_snes_failures (TSSetMaxSNESFailures)? >>> >> >>> > >>> > Ah, read the error message :) with a negative value I get this. >>> > >>> > TS can not, or is not going to try, to reconstruct my state and reduce >>> the >>> > time step. So I think I need to do this myself. >>> >>> I don't understand. Why is the linear solve diverging >>> (-ksp_converged_reason)? What TS are you using? >>> >>> > I guess just making loop and testing in the TSConvergedReason, is the >>> way >>> > to go. We already do something like this for mesh adpativity. >>> > >>> > Thanks, >>> > >>> > 23 TS dt 0.0025 time 0.1025 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > 1 SNES Function norm 2.295851692533e-01 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 1 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > 0 SNES Function norm 9.997473571601e+04 >>> > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE >>> iterations 0 >>> > [0]PETSC ERROR: --------------------- Error Message >>> > -------------------------------------------------------------- >>> > [0]PETSC ERROR: >>> > [0]PETSC ERROR: TSStep has failed due to DIVERGED_STEP_REJECTED >>> > [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/documentation/faq.html >>> for >>> > trouble shooting. >>> > [0]PETSC ERROR: Petsc Development GIT revision: v3.8-53-ga2d93b2d43 GIT >>> > Date: 2017-10-09 12:56:49 -0400 >>> > [0]PETSC ERROR: ./ex48 on a arch-macosx-gnu-O named MarksMac-5.local by >>> > markadams Wed Nov 1 13:51:24 2017 >>> > [0]PETSC ERROR: Configure options --with-cc=clang --with-cc++=clang++ >>> > COPTFLAGS="-O2 -g -mavx2" CXXOPTFLAGS="-O2 -g -mavx2" FOPTFLAGS="-O2 -g >>> > -mavx2" --download-mpich=1 --download-parmetis=1 --download-metis=1 >>> > --download-hypre=1 --download-ml=1 --download-triangle=1 >>> > --download-ctetgen=1 --download-p4est=1 --download-fftw >>> --download-mumps=1 >>> > --download-scalapack=1 --with-x=0 --download-superlu_dist >>> > --download-superlu --download-ctetgen --with-debugging=0 >>> --download-hdf5=1 >>> > PETSC_ARCH=arch-macosx-gnu-O --download-chaco --with-viewfromoptions=1 >>> > [0]PETSC ERROR: #1 TSStep() line 4130 in >>> > /Users/markadams/Codes/petsc/src/ts/interface/ts.c >>> > [0]PETSC ERROR: #2 TSSolve() line 4374 in >>> > /Users/markadams/Codes/petsc/src/ts/interface/ts.c >>> > *********** DIVERGED_STEP_REJECTED ierr=91 reason=-2 >>> > L_2 Diff: 1.32241e+07 at time 0.1025 >>> > >>> > >>> > >>> > >>> >> >>> >> > [0]PETSC ERROR: See http://www.mcs.anl.gov/petsc/d >>> ocumentation/faq.html >>> >> for >>> >> > trouble shooting. >>> >> > [0]PETSC ERROR: Petsc Development GIT revision: v3.8-53-ga2d93b2d43 >>> GIT >>> >> > Date: 2017-10-09 12:56:49 -0400 >>> >> > [0]PETSC ERROR: ./ex48 on a arch-macosx-gnu-O named MarksMac-5.local >>> by >>> >> > markadams Wed Nov 1 13:17:15 2017 >>> >> > [0]PETSC ERROR: Configure options --with-cc=clang --with-cc++=clang++ >>> >> > COPTFLAGS="-O2 -g -mavx2" CXXOPTFLAGS="-O2 -g -mavx2" FOPTFLAGS="-O2 >>> -g >>> >> > -mavx2" --download-mpich=1 --download-parmetis=1 --download-metis=1 >>> >> > --download-hypre=1 --download-ml=1 --download-triangle=1 >>> >> > --download-ctetgen=1 --download-p4est=1 --download-fftw >>> >> --download-mumps=1 >>> >> > --download-scalapack=1 --with-x=0 --download-superlu_dist >>> >> > --download-superlu --download-ctetgen --with-debugging=0 >>> >> --download-hdf5=1 >>> >> > PETSC_ARCH=arch-macosx-gnu-O --download-chaco >>> --with-viewfromoptions=1 >>> >> > [0]PETSC ERROR: #1 TSStep() line 4129 in >>> >> > /Users/markadams/Codes/petsc/src/ts/interface/ts.c >>> >> > [0]PETSC ERROR: #2 TSSolve() line 4374 in >>> >> > /Users/markadams/Codes/petsc/src/ts/interface/ts.c >>> >> > [0]PETSC ERROR: #3 main() line 1161 in /Users/markadams/Codes/mhd/ >>> >> src/ex48.c >>> >> >>> >> >>
