text: #pragma acc data copy (h_g2 [0:nbin]) copyin (h_x [0:nconf * numatm], h_z [0:nconf * numatm], h_y [0:nconf * numatm])
  #pragma acc routine seq
  #pragma acc parallel loop gang vector_length (128) default (present)
  #pragma acc loop vector
  #pragma acc atomic 
  