[Users] meeting minutes for 2015-08-31

[Frank Loeffler]

On Wed, Sep 02, 2015 at 09:55:39PM -0400, Roland Haas wrote:
> Would it already be sufficient to have a thorn IOHDF5Timeseries which
> provides another output method (along with IOASCII, IOHDF5 and IOScalar)
> that writes variables as time-series ie. extensible HDF5 datasets with
> the first dimension being time? If given an option like
> one_file_per_group it would combine all scalars in a group into
> different columns of the output dataset. It would not be able to write
> grid functions (or slices of them) since their extent can change during
> the simulation but it would be able to write SCALARs and ARRAYS as well
> as 0d data. The thorn would write one HDF5 dataset per Cactus variable.
> This would mean that the new output method behaves very much like the
> current ones and is more or less the equivalent CarpetIOASCII's compact
> output format which works decently well for ASCII timeseries output.

It would solve the "HDF5" issue, but not the one Ian mentioned: that
sometimes data can be invalid. We don't have a good mechanism for thorns
to mark data as currently invalid (e.g. AHFinder quantities).

Frank

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