Fix mpi bug#217
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awvwgk
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Jul 17, 2026
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Thanks, looks good to me.
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Fix for cp2k/cp2k#5537
as described there, the problem was using the global communicator, because cp2k actually passes a subgroup in and then indices derived from the global one are wrong. Exactly what they described in the issue.
Added a test and compiled cp2k with it and then the error seems to be gone.