To find out what is going on, we need to find out which thorn called on Carpet to interpolate in time for what reason. A stack backtrace or similar information would be useful.

-erik

On Mon, Dec 12, 2011 at 12:45 PM, Yosef Zlochower <yosef@astro.rit.edu> wrote:

On 12/12/2011 12:11 PM, Erik Schnetter wrote:

Other causes for a timer interpolation may be a spatial interpolation at
a time where the coarse grid does not exist, or a reduction operation at
such a time (e.g. for scalar output).

I haven't declared it with prolongation=none, but I never interpolate
it, reduce it, or sync it.

How do you declare this variable? You may need to explicitly tell Carpet
to leave this variable alone, or to report an error when such an
operation is attempted.

How do I do this?

-erik

On Mon, Dec 12, 2011 at 11:35 AM, Frank Loeffler <knarf@cct.lsu.edu
<mailto:knarf@cct.lsu.edu>> wrote:

On Mon, Dec 12, 2011 at 10:32:55AM -0500, Yosef Zlochower wrote:
> -> Internal error: extrapolation in time. variable=LAZEV::dotalp
> time=118.90625 times=[118.9375]
>
> I am unsure how the times could have gotten out of sync at such a
late
> time in the simulation without getting out of sync earlier. I also
> do not understand why a time interpolation should have been attempted
> in the first place. I don't sync or attempt to interpolate this GF.

Do you regrid at that time? It might happen that in order to regrid at
that particular time Carpet would need to interpolate in time, and it
didn't do before because levels might have been lined up at the time of
regridding.

Frank

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