Restarted block-GMRES with deflation of eigenvalues

  • Authors:
  • Ronald B. Morgan

  • Affiliations:
  • Department of Mathematics, Baylor University, Waco, TX 76798-7328, USA

  • Venue:
  • Applied Numerical Mathematics - 6th IMACS International symposium on iterative methods in scientific computing
  • Year:
  • 2005

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Abstract

Block-GMRES is an iterative method for solving nonsymmetric systems of linear equations with multiple right-hand sides. Restarting may be needed, due to orthogonalization expense or limited storage. We discuss how restarting affects convergence and the role small eigenvalues play. Then a version of restarted block-GMRES that deflates eigenvalues is presented. It is demonstrated that deflation can be particularly important for block methods.