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Dear Leo,

> The only question I have is that when I look at the statistics of 
> the run (created by Cactus at the end of the run) I see that over 
> 50% of the excution time was devoted to applying the periodic 
> boundary conditions. This seems very strange to me. Am I reading 
> the statistics correctly? Are those statistics correct? Is this 
> some strange interaction between the Periodic thorn and some other
>  thorns?
In the Noether release this is caused by LoopControl (we do not quite
understand why, Gauss seems not affected). It affects all thorns using
LoopControl, Periodic is just very obvious. It can be worked around by
adding LoopControl::settle_after_iteration = 0 in your .par file. See
https://trac.einsteintoolkit.org/ticket/1512 for some more details.

The current development version already contains the workaround so it
will be in the next release. Since there are multiple reports of this
by now I think we really should backport the workaround.

Anyone: any objections to backporting #1512 ? If not I'll backport it
tomorrow. We'd need another tag and announcement as well.

Yours
Roland

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