[Users] running ML_ADMConstraints with timelevels=1 and no SYNCs

[Frank Loeffler]

On Thu, Sep 22, 2016 at 08:14:42PM -0500, Roland Haas wrote:
>I am wondering if there would be anything wrong with running
>ML_ADMConstraints with just a single time level for the constraints as
>well as using no SYNCs for it as long as I set it's calc_every
>parameter to the frequency of the coarsest level.
>
>Obviously this will give my "nonssense" values in the ghost zones,
>buffer zones and boundary (though on the boudary I can just set it to
>zero).
>
>However since the constraints are pure output and nothing ever depends
>on them the bad values only matter if they were to eg show up in the
>norms. It is my recollection that CarpetReduce actually does not use
>any values from the ghost zones (certainly that would be wrong) or
>buffer zones (this may be more recent).
>
>Is there any any other way the "bad" values could make it into the
>norms? Note that I do not worry about 1d, 2d, 3d output for the
>constraints.

I think this should be fine, provided you not only set calc_every to 
your coarse step, but also your output frequency for the norms (or 
adjust your post-processing for that). The former shouldn't even be 
necessary, but why would you calculate them more often then you output 
them...

Frank

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