[Carpet] Error when using moving grids

[Erik Schnetter]

On Aug 23, 2006, at 14:01:36, Yosef Zlochower wrote:

> Erik Schnetter wrote:
>> On Aug 23, 2006, at 12:39:17, Yosef Zlochower wrote:
>>
>>> Hi,
>>>
>>>   I am using CarpetRegrid2 and CarpetTracker to adjust the
>>> grid to the position of the black holes. I get the following
>>> error on the 512'th iteration.
>>>
>>> Internal error: extrapolation in time.  time=511  times=[512]
>>>
>>> I regrid every 256, but the black holes were essentially stationary,
>>> so this may be the first time that carpet attempted to regrid.
>>>
>>> I did not use any refinement in time, and set the prolongation
>>> order in time to zero.
>>>
>>> The parfile is attached.
>>
>>
>> I don't see anything suspicious in your parameter file.
>>
>> Can you find out where the error message is created?
>>
>> -erik
>>
>
> Here is the full message
>
> WARNING level 0 in thorn CarpetLib processor 1 host node2.oscardomain
>    (line 1680 of Cactus/configs/carpetmol/build/CarpetLib/data.cc):
>    -> Internal error: extrapolation in time.  time=511  times=[512]

That is a generic routine that checks whether time interpolation is  
consistent.  Can you generate a backtrace to see where it is called?

At the moment I assume the problem could be that you specified 0th  
order time interpolation, which uses only 1 time level, so that  
basically everything you do would be "extrapolation".  Using 1st  
order interpolation may help.  However, there should not be any time  
interpolation occurring in your setup, so there could be a bug  
somewhere.

-erik

-- 
Erik Schnetter <schnetter at cct.lsu.edu>

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