naromero

# Perform a geomtry optimizationfrom ase import Atoms, PickleTrajectory, readfrom ase.optimize.lbfgs import LBFGS, LBFGSLineSearchfrom gpaw import GPAW, Mixer, MixerSum, ConvergenceError, PoissonSolverfrom gpaw.poisson import PoissonSolverfrom gpaw.eigensolvers.rmm_diis import RMM_DIISps = PoissonSolver(nn='M', relax='GS', eps=1e-9)es = RMM_DIIS(keep_htpsit=False)# Makes Python traceback appear only on the root processorimport sysfrom gpaw.mpi import worldfrom ase.utils import devnullif world.rank != 0:    sys.stderr = devnullepsilon = 0.02 # small perturbationa = 4.08bulk = Atoms('Au4', positions=((0, 0 ,0),                               (0.5, 0.5, 0),                               (0.5, epsilon, 0.5),                               (0, 0.5, 0.5)), pbc=True)bulk.set_cell((a,a,a), scale_atoms=True)bulk = bulk.repeat((1, 1, 1))calc = GPAW(h=0.16,            maxiter=200,            mode = 'fd',            poissonsolver = ps,            nbands = 30,            spinpol = False,            xc = 'LDA',            width = 0.01,            mixer = Mixer(0.10, 5, 100.0),             # mixer = MixerSum(0.10, 5, 100.0), # spinpol = True            eigensolver = es,            parallel = {'buffer_size':2048},            txt = 'Au_bulk.out')bulk.set_calculator(calc)# spinpol = True# magmom = 2.0# mms = [magmom for i in range(len(bulk))]# bulk.set_initial_magnetic_memonts(mms)world.barrier() # make sure things are synchronizedmode = 'w'traj = PickleTrajectory('qn.traj', mode, bulk)relax = LBFGS(bulk, logfile = 'qn.log', trajectory = traj, restart= 'qn.pckl')relax.attach(lambda: calc.write('Au_bulk.%d.hdf5' % relax.nsteps))relax.run(fmax=0.05, steps=2)