TY  - JOUR
AU  - Bietenholz, W.
AU  - Eicker, N.
AU  - Frommer, A.
AU  - Lippert, Th.
AU  - Medeke, B.
AU  - Schilling, K.
AU  - Weuffen, G.
TI  - Preconditioning of improved and “perfect” fermion actions
JO  - Computer physics communications
VL  - 119
IS  - 1
SN  - 0010-4655
CY  - Amsterdam
PB  - North Holland Publ. Co.
M1  - FZJ-2019-01076
SP  - 1 - 18
PY  - 1999
AB  - 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.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1016/S0010-4655(98)00187-8
UR  - https://juser.fz-juelich.de/record/860301
ER  -