Dominik
Carpet calculates these region sizes automatically based on the parameters. This calculation can fail (and will then sometimes lead to strange errors such as the one you reported) if either: - the coarse grid has too few points (since Carpet cannot increase the coarse grid size) - there are too many processes used (since Carpet is not always clever enough to leave some of the processes unused)
It is sometimes surprising how many grid points are needed for a self-consistent grid setup. For example, with 3 ghost zones and an RK4 operator, the coarse grid needs to have more than 30 grid points or so at least to contain all ghost and buffer zones around the fine grid. If there is only a single grid, arbitrarily small domains should be possible (if you set up the boundaries correctly).
The error messages should probably be improved.
As a remedy, I recommend using fewer MPI processes and/or increasing the resolution of the coarse grid.
-erik
On Thu, Nov 28, 2019 at 3:41 AM Dominik Guido Rhiem s6dorhie@uni-bonn.de wrote:
Dear all,
in order to decrease the necessary calculations for a simulation, I tried to lower the resolution and limit the domain size of the simulation. However, I get the error that the communicated region has to be contained within the active part of the domain; I don't see where the issue is in my parameter file, though. I paid attention that the region size is an integer multiple of the resolution and to not extract e.g. gravitational waves from surfaces at a larger radius than the region size. I have attached both the error file, the output file and the parameter file. (Note that I also use some non-standard thorns, e.g. for seeding magnetic fields.)
Sincerely, Dominik Rhiem
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