[Users] [External] Checkpointing with parameter change 8%

[Garrison, David]

Hello,

I noticed that the ReadInterpolate Thorn only works with Carpet.  Is it possible to get something like it for Pugh?  What would be the differences?

-DG

> On Oct 2, 2019, at 12:33 PM, Haas, Roland <rhaas at illinois.edu> wrote:
> 
> Hello DG,
> 
>> Is it possible to restart a checkpointed run with a few parameters
>> changed?  For example, can you run a simulation with checkpoint, then
>> restart it from the last checkpoint using different values of maximum
>> and minimum grid range values (as well as different grid spacing) if
>> you keep the number  of grid points the same?
> You can change with some parameters changed. The parameters are the
> ones that are marked as "STEERABLE=recover" or "STEERABLE=always" in
> their respective thorn's param.ccl files.
> 
> Unfortunately the grid range values and the spacing are not among those
> (since they would require that data is re-interpolated onto those).
> 
> There is a thorn ReadInterpolate that can do that. See
> https://github.com/rhaas80/ReadInterpolate.git (you can find a number of non-ET thorns of interest collected here: https://docs.einsteintoolkit.org/et-docs/Thorns_we_know_of).
> 
> Please see the test file
> https://github.com/rhaas80/ReadInterpolate/blob/master/ReadInterpolate/test/admhydro.par for how to use it (it reads data that were written by the parfile tov_write.parfile).
> 
> Please note that you most likely will see small "jump" in your
> simulation since ReadInterpolate acts as an initial data reader so it
> will only (at least in the "master" version) set the current timelevel
> values but not past ones which can affect values in mesh refinement
> boundaries.
> 
> Yours,
> Roland
> 
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