Re: [petsc-users] puzzling arkimex logic
Thanks, it is working fine. Mark On Wed, Jan 4, 2023 at 1:12 PM Jed Brown wrote: > This default probably shouldn't be zero, and probably lengthening steps > should be more gentle after a recent failure. But Mark, please let us know > if what's there works for you. > > "Zhang, Hong via petsc-users" writes: > > > Hi Mark, > > > > You might want to try -ts_adapt_time_step_increase_delay to delay > increasing the time step after it has been decreased due to a failed solve. > > > > Hong (Mr.) > > > >> On Jan 2, 2023, at 12:17 PM, Mark Adams wrote: > >> > >> I am using arkimex and the logic with a failed KSP solve is puzzling. > This step starts with a dt of ~.005, the linear solver fails and cuts the > time step by 1/4. So far, so good. The step then works but the next time > step the time step goes to ~0.006. > >> TS seems to have forgotten that it had to cut the time step back. > >> Perhaps that logic is missing or my parameters need work? > >> > >> Thanks, > >> Mark > >> > >> -ts_adapt_dt_max 0.01 # (source: command line) > >> -ts_adapt_monitor # (source: file) > >> -ts_arkimex_type 1bee # (source: file) > >> -ts_dt .001 # (source: command line) > >> -ts_max_reject 10 # (source: file) > >> -ts_max_snes_failures -1 # (source: file) > >> -ts_max_steps 8000 # (source: command line) > >> -ts_max_time 14 # (source: command line) > >> -ts_monitor # (source: file) > >> -ts_rtol 1e-6 # (source: command line) > >> -ts_type arkimex # (source: file) > >> > >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > >> TSAdapt basic arkimex 0:1bee step 1 accepted t=0.001 + > 2.497e-03 dt=5.404e-03 wlte=0.173 wltea= -1 wlter= > >> -1 > >> 2 TS dt 0.00540401 time 0.00349731 > >> 0 SNES Function norm 1.358886930084e-05 > >> Linear solve did not converge due to DIVERGED_ITS iterations 100 > >> Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE > iterations 0 > >> TSAdapt basic step 2 stage rejected (DIVERGED_LINEAR_SOLVE) > t=0.00349731 + 5.404e-03 retrying with dt=1.351e-03 > >> 0 SNES Function norm 1.358886930084e-05 > >> Linear solve converged due to CONVERGED_RTOL iterations 19 > >> 1 SNES Function norm 4.412110425362e-10 > >> Linear solve converged due to CONVERGED_RTOL iterations 6 > >> 2 SNES Function norm 4.978968053066e-13 > >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > >> 0 SNES Function norm 8.549322067920e-06 > >> Linear solve converged due to CONVERGED_RTOL iterations 14 > >> 1 SNES Function norm 8.357075378456e-11 > >> Linear solve converged due to CONVERGED_RTOL iterations 4 > >> 2 SNES Function norm 4.983138402512e-13 > >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > >> 0 SNES Function norm 1.044832467924e-05 > >> Linear solve converged due to CONVERGED_RTOL iterations 13 > >> 1 SNES Function norm 1.036101875301e-10 > >> Linear solve converged due to CONVERGED_RTOL iterations 4 > >> 2 SNES Function norm 4.984888077288e-13 > >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > >> TSAdapt basic arkimex 0:1bee step 2 accepted t=0.00349731 + > 1.351e-03 dt=6.305e-03 wlte=0.0372 wltea= -1 wlter= > >> -1 > >> 3 TS dt 0.00630456 time 0.00484832 > >> 0 SNES Function norm 8.116559104264e-06 > >> Linear solve did not converge due to DIVERGED_ITS iterations 100 >
Re: [petsc-users] puzzling arkimex logic
This default probably shouldn't be zero, and probably lengthening steps should be more gentle after a recent failure. But Mark, please let us know if what's there works for you. "Zhang, Hong via petsc-users" writes: > Hi Mark, > > You might want to try -ts_adapt_time_step_increase_delay to delay increasing > the time step after it has been decreased due to a failed solve. > > Hong (Mr.) > >> On Jan 2, 2023, at 12:17 PM, Mark Adams wrote: >> >> I am using arkimex and the logic with a failed KSP solve is puzzling. This >> step starts with a dt of ~.005, the linear solver fails and cuts the time >> step by 1/4. So far, so good. The step then works but the next time step the >> time step goes to ~0.006. >> TS seems to have forgotten that it had to cut the time step back. >> Perhaps that logic is missing or my parameters need work? >> >> Thanks, >> Mark >> >> -ts_adapt_dt_max 0.01 # (source: command line) >> -ts_adapt_monitor # (source: file) >> -ts_arkimex_type 1bee # (source: file) >> -ts_dt .001 # (source: command line) >> -ts_max_reject 10 # (source: file) >> -ts_max_snes_failures -1 # (source: file) >> -ts_max_steps 8000 # (source: command line) >> -ts_max_time 14 # (source: command line) >> -ts_monitor # (source: file) >> -ts_rtol 1e-6 # (source: command line) >> -ts_type arkimex # (source: file) >> >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 >> TSAdapt basic arkimex 0:1bee step 1 accepted t=0.001 + >> 2.497e-03 dt=5.404e-03 wlte=0.173 wltea= -1 wlter= >> -1 >> 2 TS dt 0.00540401 time 0.00349731 >> 0 SNES Function norm 1.358886930084e-05 >> Linear solve did not converge due to DIVERGED_ITS iterations 100 >> Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE iterations 0 >> TSAdapt basic step 2 stage rejected (DIVERGED_LINEAR_SOLVE) >> t=0.00349731 + 5.404e-03 retrying with dt=1.351e-03 >> 0 SNES Function norm 1.358886930084e-05 >> Linear solve converged due to CONVERGED_RTOL iterations 19 >> 1 SNES Function norm 4.412110425362e-10 >> Linear solve converged due to CONVERGED_RTOL iterations 6 >> 2 SNES Function norm 4.978968053066e-13 >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 >> 0 SNES Function norm 8.549322067920e-06 >> Linear solve converged due to CONVERGED_RTOL iterations 14 >> 1 SNES Function norm 8.357075378456e-11 >> Linear solve converged due to CONVERGED_RTOL iterations 4 >> 2 SNES Function norm 4.983138402512e-13 >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 >> 0 SNES Function norm 1.044832467924e-05 >> Linear solve converged due to CONVERGED_RTOL iterations 13 >> 1 SNES Function norm 1.036101875301e-10 >> Linear solve converged due to CONVERGED_RTOL iterations 4 >> 2 SNES Function norm 4.984888077288e-13 >> Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 >> TSAdapt basic arkimex 0:1bee step 2 accepted t=0.00349731 + >> 1.351e-03 dt=6.305e-03 wlte=0.0372 wltea= -1 wlter= >> -1 >> 3 TS dt 0.00630456 time 0.00484832 >> 0 SNES Function norm 8.116559104264e-06 >> Linear solve did not converge due to DIVERGED_ITS iterations 100
Re: [petsc-users] puzzling arkimex logic
Hi Mark, You might want to try -ts_adapt_time_step_increase_delay to delay increasing the time step after it has been decreased due to a failed solve. Hong (Mr.) > On Jan 2, 2023, at 12:17 PM, Mark Adams wrote: > > I am using arkimex and the logic with a failed KSP solve is puzzling. This > step starts with a dt of ~.005, the linear solver fails and cuts the time > step by 1/4. So far, so good. The step then works but the next time step the > time step goes to ~0.006. > TS seems to have forgotten that it had to cut the time step back. > Perhaps that logic is missing or my parameters need work? > > Thanks, > Mark > > -ts_adapt_dt_max 0.01 # (source: command line) > -ts_adapt_monitor # (source: file) > -ts_arkimex_type 1bee # (source: file) > -ts_dt .001 # (source: command line) > -ts_max_reject 10 # (source: file) > -ts_max_snes_failures -1 # (source: file) > -ts_max_steps 8000 # (source: command line) > -ts_max_time 14 # (source: command line) > -ts_monitor # (source: file) > -ts_rtol 1e-6 # (source: command line) > -ts_type arkimex # (source: file) > > Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > TSAdapt basic arkimex 0:1bee step 1 accepted t=0.001 + 2.497e-03 > dt=5.404e-03 wlte=0.173 wltea= -1 wlter= > -1 > 2 TS dt 0.00540401 time 0.00349731 > 0 SNES Function norm 1.358886930084e-05 > Linear solve did not converge due to DIVERGED_ITS iterations 100 > Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE iterations 0 > TSAdapt basic step 2 stage rejected (DIVERGED_LINEAR_SOLVE) > t=0.00349731 + 5.404e-03 retrying with dt=1.351e-03 > 0 SNES Function norm 1.358886930084e-05 > Linear solve converged due to CONVERGED_RTOL iterations 19 > 1 SNES Function norm 4.412110425362e-10 > Linear solve converged due to CONVERGED_RTOL iterations 6 > 2 SNES Function norm 4.978968053066e-13 > Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > 0 SNES Function norm 8.549322067920e-06 > Linear solve converged due to CONVERGED_RTOL iterations 14 > 1 SNES Function norm 8.357075378456e-11 > Linear solve converged due to CONVERGED_RTOL iterations 4 > 2 SNES Function norm 4.983138402512e-13 > Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > 0 SNES Function norm 1.044832467924e-05 > Linear solve converged due to CONVERGED_RTOL iterations 13 > 1 SNES Function norm 1.036101875301e-10 > Linear solve converged due to CONVERGED_RTOL iterations 4 > 2 SNES Function norm 4.984888077288e-13 > Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 > TSAdapt basic arkimex 0:1bee step 2 accepted t=0.00349731 + 1.351e-03 > dt=6.305e-03 wlte=0.0372 wltea= -1 wlter= > -1 > 3 TS dt 0.00630456 time 0.00484832 > 0 SNES Function norm 8.116559104264e-06 > Linear solve did not converge due to DIVERGED_ITS iterations 100
[petsc-users] puzzling arkimex logic
I am using arkimex and the logic with a failed KSP solve is puzzling. This step starts with a dt of ~.005, the linear solver fails and cuts the time step by 1/4. So far, so good. The step then works but the next time step the time step goes to ~0.006. TS seems to have forgotten that it had to cut the time step back. Perhaps that logic is missing or my parameters need work? Thanks, Mark -ts_adapt_dt_max 0.01 # (source: command line) -ts_adapt_monitor # (source: file) -ts_arkimex_type 1bee # (source: file) -ts_dt .001 # (source: command line) -ts_max_reject 10 # (source: file) -ts_max_snes_failures -1 # (source: file) -ts_max_steps 8000 # (source: command line) -ts_max_time 14 # (source: command line) -ts_monitor # (source: file) -ts_rtol 1e-6 # (source: command line) -ts_type arkimex # (source: file) Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 TSAdapt basic arkimex 0:1bee step 1 accepted t=0.001 + 2.497e-03 dt=5.404e-03 wlte=0.173 wltea= -1 wlter= -1 2 TS dt 0.00540401 time 0.00349731 0 SNES Function norm 1.358886930084e-05 Linear solve did not converge due to DIVERGED_ITS iterations 100 Nonlinear solve did not converge due to DIVERGED_LINEAR_SOLVE iterations 0 TSAdapt basic step 2 stage rejected (DIVERGED_LINEAR_SOLVE) t=0.00349731 + 5.404e-03 retrying with dt=1.351e-03 0 SNES Function norm 1.358886930084e-05 Linear solve converged due to CONVERGED_RTOL iterations 19 1 SNES Function norm 4.412110425362e-10 Linear solve converged due to CONVERGED_RTOL iterations 6 2 SNES Function norm 4.978968053066e-13 Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 0 SNES Function norm 8.549322067920e-06 Linear solve converged due to CONVERGED_RTOL iterations 14 1 SNES Function norm 8.357075378456e-11 Linear solve converged due to CONVERGED_RTOL iterations 4 2 SNES Function norm 4.983138402512e-13 Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 0 SNES Function norm 1.044832467924e-05 Linear solve converged due to CONVERGED_RTOL iterations 13 1 SNES Function norm 1.036101875301e-10 Linear solve converged due to CONVERGED_RTOL iterations 4 2 SNES Function norm 4.984888077288e-13 Nonlinear solve converged due to CONVERGED_SNORM_RELATIVE iterations 2 TSAdapt basic arkimex 0:1bee step 2 accepted t=0.00349731 + 1.351e-03 dt=6.305e-03 wlte=0.0372 wltea= -1 wlter= -1 3 TS dt 0.00630456 time 0.00484832 0 SNES Function norm 8.116559104264e-06 Linear solve did not converge due to DIVERGED_ITS iterations 100
