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Adaptive domain decomposition multigrid for lattice QCD / von Matthias Rottmann aus Wuppertal. Wuppertal, [2016]
Inhalt
Introduction
Quantum Chromodynamics
Continuum QCD
Lattice QCD and the Wilson Discretization
Smearing and Normality
Domain Decomposition Methods
Additive and Multiplicative Schwarz
Red-Black Multiplicative Schwarz
Sixteen Color Multiplicative Schwarz
Implementation Details – The Wilson-Dirac Operator
Odd-even preconditioning
Implementation Details – Schwarz Methods
Odd-even preconditioning
Numerical Results
Comparison of Schwarz Methods
Comparison with Krylov Subspace Methods
Scaling Tests
Algebraic Multigrid
Aggregation-based Intergrid Transfer Operators
Petrov-Galerkin Approach in Lattice QCD
Adaptive Test Vector Computation
Adaptivity in Aggregation-based AMG
Adaptivity in Bootstrap AMG
Implementation Details
Prolongation and Restriction
The Coarse Grid Operator
Inexact Deflation
Deflation Subspace
Comparison of Multigrid and Inexact Deflation
Adaptivity in the Setup of Inexact Deflation
GMRES-smoothed AMG
Setup Procedure
Two-Level DD-AMG
Adaptive Two-Level Setup Procedure
Numerical Two-Level Results
Comparison with BiCGStab
Setup Evaluation
Scaling Tests
Comparison with the Inexact Deflation Method
GMRES/GCR Smoothing and ``AMG''
Multilevel DD-AMG
Multilevel Cycling Strategies
V-Cycles and W-Cycles
K-Cycles
Adaptive Multilevel Setup Procedure
Implementation Details – Idling Processes
Numerical Multilevel Results
Parallel Multilevel Methods
Two, Three and Four Levels
Comparison with BiCGStab
Scaling Tests
Reducing the Impact of Communication in Coarse Grid Solvers
Low Level Optimization
Comparison with Inexact Deflation with Inaccurate Projection
GMRES/GCR Smoothing and ``AMG''
Preconditioning the Overlap Dirac Operator
The Overlap Discretization
A Preconditioner Based on the Wilson-Dirac Operator
Numerical Results
Accuracy of the Preconditioner and Influence of m0prec
Quality and Cost of the Preconditioner
Comparison of Optimized Solvers
List of Algorithms
List of Figures
List of Tables
Bibliography