Comment (by Lunan Sun):

Some additional information (not sure if it’s useful)

Cluster: Stampede2

Nodes:128

MPI processes:512

Also, I have been decreasing the grid boundary for tests. And I find that the code can run with the boundary set at 12.3 but failed at 12.6, with the setup above.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2471/carpet-npoints-d-max-issue