Oh, Maybe the Jacobian has Nans or Infs even though the last time step survived. Maybe it was going crazy. I'll check
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 >> >> >> > >
