fix: fix MPI race condition in permittivity file output#3
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Move root rank check before opening the output file to prevent multiple MPI processes from simultaneously creating/truncating the file. This fixes intermittent null bytes appearing at the beginning of permittivity.dat when running with multiple processes.
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Move root rank check before opening the output file to prevent multiple MPI processes from simultaneously creating/truncating the file. This fixes intermittent null bytes appearing at the beginning of permittivity.dat when running with multiple processes.