Dear Bifeng,


thank you for reaching out!

Yes, you are doing everything all right and I actually just enabled that
"feature" to allow such a restart with disabled moving window a couple
of months ago, ... but have forgotten to publish it (the master student
that needed it was happy ;)  )

Depending on HDF5 or ADIOS for restarting, just remove the "if-line" here:

https://github.com/ComputationalRadiationPhysics/picongpu/blob/0.2.1/src/picongpu/include/plugins/hdf5/HDF5Writer.hpp#L208
or here:

https://github.com/ComputationalRadiationPhysics/picongpu/blob/0.2.1/src/picongpu/include/plugins/adios/ADIOSWriter.hpp#L695

then recompile & restart.

From the quick testing I did back then this:
 - does not break restart that keep "-m"
 - allows restarts that remove the "-m" to stop the window.

But be aware, that restarting new checkpoints from that simulation's
restart steps will then not be able to "enable" moving window again,
since that would require more logic in our window (we would have to
remember how long you "paused" the moving window).


Does that help? If yes, I will add that feature to the `dev` branch.


All the best,
Axel

On 01.12.2016 17:24, Bifeng Lei wrote:
> Dear Axel,
>
> I am currently running a laser wakefield simulation by PIConGPU on
> Hypnos cluster. A problem occurs when I try to restart a simulation in
> such steps:
>
>  1.  run a simulation *with moving window* and checkout after some
>     steps. The attached picture (*e_png_yx_0.5_004000.png*) is the
>     output at the checkout point.
>  2.  restart the simulation from the checkout point *without the moving
>     window* by setting /TBG_movingWindow="". /It means to just stop the
>     window at this position. Right?  The laser could be correctly loaded
>     again. But, it seems that the plasma could not be will correctly
>     load. Please see the attached picture (*e_png_yx_0.5_004200.png*).
>
> Now, if I restart the simulation from the same checkout point with
> moving window (/TBG_movingWindow="-m"/), everything seems fine. Please
> see the picture *e_png_yx_0.5_004200_mw.png.*
>
> The 2D demo simulation shown here is from the LaserWakefield-example
> shipped with the code
> (https://github.com/ComputationalRadiationPhysics/picongpu/tree/master/examples/LaserWakefield).
>
> I am just wondering if anything I am doing incorrect here.
>
> So many thanks in advance.
>
> With best regards,
> Bifeng Lei
>
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--

Axel Huebl
Phone +49 351 260 3582
https://www.hzdr.de/crp
Computational Radiation Physics
Laser Particle Acceleration Division
Helmholtz-Zentrum Dresden - Rossendorf e.V.

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