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@ARTICLE{Bietenholz:860301,
      author       = {Bietenholz, W. and Eicker, N. and Frommer, A. and Lippert,
                      Th. and Medeke, B. and Schilling, K. and Weuffen, G.},
      title        = {{P}reconditioning of improved and “perfect” fermion
                      actions},
      journal      = {Computer physics communications},
      volume       = {119},
      number       = {1},
      issn         = {0010-4655},
      address      = {Amsterdam},
      publisher    = {North Holland Publ. Co.},
      reportid     = {FZJ-2019-01076},
      pages        = {1 - 18},
      year         = {1999},
      abstract     = {We construct a locally-lexicographic SSOR preconditioner to
                      accelerate the parallel iterative solution of linear systems
                      of equations for two improved discretizations of lattice
                      fermions: (i) the Sheikholeslami-Wohlen scheme Where a
                      non-constant block-diagonal term is added to the Wilson
                      fermion matrix and (ii) renormalization group improved
                      actions which incorporate couplings beyond nearest neighbors
                      of the lattice fermion fields. In case (i) we find the block
                      ll-SSOR-scheme to be more effective by a factor ≈ 2 than
                      odd-even preconditioned solvers in terms of convergence
                      rates, at β = 6.0. For type (ii) actions, we show that our
                      preconditioner accelerates the iterative solution of a
                      linear system of hypercube fermions by a factor of 3 to 4.},
      ddc          = {530},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/S0010-4655(98)00187-8},
      url          = {https://juser.fz-juelich.de/record/860301},
}