[Carpet] Error when recovering from a checkpoint file

[Erik Schnetter]

On Aug 24, 2006, at 16:23:48, Ian Hinder wrote:

> On Thu, Aug 24, 2006 at 03:50:48PM -0500, Erik Schnetter wrote:
>> On Aug 24, 2006, at 14:57:55, Nils Dorband wrote:
>>
>>> Hi,
>>>
>>> I am having trouble to recover from a checkpoint file. I get the
>>> following error:
>>>
>>> Activating thorn CarpetIOHDF5...Success -> active implementation
>>> IOHDF5
>>> While reading characters from a stream:
>>>    Character ',' expected, but not found.
>>>    The next up to 100 available characters are "".
>>> Input error while reading a bbox
>>> Input error while reading a vector<>
>>>    The following elements have been read so far: []
>>> Input error while reading a vector<>
>>>    The following elements have been read so far: []
>>> Input error while reading a vector<>
>>>    The following elements have been read so far: []
>>>
>>>
>>>
>>> Then the run stops. This happens with a run using Multipatch. I only
>>> see the error on supermike. It is working just fine on a different
>>> machine. I am wondering if someone encountered that problem before
>>> and what the reason might be.
>>
>> This is a parsing routine in Carpet.  It interprets e.g. the strings
>> that describe the grid structure.  These strings can be given as
>> parameters.  They are also stored in checkpoint files.  Apparently
>> the string is malformed or missing.
>
> Do you have newlines in the parameter?  The currentl implementation
> for checkpointing and recovery of parameters is not compatible with
> parameters containing newline characters.  When you checkpoint, the
> parameters from your simulation are written into one long string in
> the HDF5 file, separated by newlines as the delimiters.  So the
> parameters will be corrupted when read back in if they have newlines
> in them.  One fix would be to modify the routine that writes out the
> parameters to just replace newlines with spaces or empty strings.
> Alternatively, just avoid putting newlines in your parameters.

When Cactus reads parameters, it skips newlines.

What is incompatible?  I didn't know.  It is possible to put newlines  
into parameters at run time.

The grid structure that is written to a checkpoint file is generated  
from scratch, and it contains no white space.  (I just checked the  
file in question.)

-erik

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

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