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Up to and including Ver. 3.6, the number of MPI processes that users can utilize for the parallel calculations is limited up to the number of atoms in the system. OpenMX Ver. 3.8 does no have the limitation. Even if the number of MPI processes exceeds the number of atoms, the MPI parallelization is efficiently performed. The functionality may be useful especially for a calculation where the number of k-points is much larger than the number of atoms in the system.