mpiWorld.getComm().Bcast (&opt_nx, 1, MPI::INT, 0);
mpiWorld.getComm().Bcast (&opt_ny, 1, MPI::INT, 0);
mpiWorld.getComm().Bcast (&opt_nsample, 1, MPI::INT, 0);
mpiWorld.getComm().Bcast (&opt_nx, 1, MPI::INT, 0);
mpiWorld.getComm().Bcast (&opt_ny, 1, MPI::INT, 0);
mpiWorld.getComm().Bcast (&opt_nsample, 1, MPI::INT, 0);