[petsc-users] Resuming analysis by importing Trajectory Data from external source

[Mohammed Ashour]

Oh, thanks for the tip.
I can do that. Aside from the solution vector, step number, and time, are
there any hidden details in TS I need to dump that would be essential for
the next run?

Thanks in advance
Yours Sincerely
On Sat, May 9, 2020 at 9:40 PM Stefano Zampini <stefano.zampini at gmail.com>
wrote:

> You do not want to use TSTrajectory for that. The trajectory object is
> meant to be used for sensitivity analysis to store _all_ the intermediate
> time steps and the perform backward integration.
>
> You should code a TSMonitor that dumps every n time steps and then use the
> last one to restart the simulation.
>
> On May 9, 2020, at 10:30 PM, Mohammed Ashour <ashour.msc at gmail.com> wrote:
>
> Dear All,
> I'm using PETSc in conjunction wit PetIGA to solve a 3D phase-field
> problem on HPC cluster.
> Given the computational load of the code, I'm running it on 15 nodes with
> a multithreaded job. Now there is a wall time for the current partition set
> to 24 hours, afterward, the job will be killed.
>
> I have been searching for the possibility of using the Trajectory to
> resume the run after it being terminated by reloading the dumped binary
> files from TSSetSaveTrajectory once again into the TS, i.e., state vector
> and it's time derivative, timestep and time.
>
> I have tried using TSTrajectoryGet but I ended up with the following error:
> [0]PETSC ERROR: Object is in wrong state
> [0]PETSC ERROR: TS solver did not save trajectory
>
> So, I would like to ask if in theory that would be possible? if so, how
> can I reload the trajectory from a previously terminated job into a new one?
>
> Yours Sincerely.
>
> --
>
> *Mohammed Ashour, M.Sc.*PhD Scholar
> Bauhaus-Universität Weimar
> Institute of Structural Mechanics (ISM)
> Marienstraße 7
> 99423 Weimar, Germany
> Mobile: +(49) 176 58834667
>
>
>

-- 

*Mohammed Ashour, M.Sc.*PhD Scholar
Bauhaus-Universität Weimar
Institute of Structural Mechanics (ISM)
Marienstraße 7
99423 Weimar, Germany
Mobile: +(49) 176 58834667
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