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Accelerator (cont.)<br />
Algorithm: Speed up Lanczos convergence by shift-invert<br />
Seek largest eigenvalues, well separated, of the transformed<br />
system<br />
M (K - σ M) -1 x = µ x<br />
µ = 1 / (λ - σ)<br />
Shift-invert Lanczos (SIL)<br />
PARPACK: implicitly restarted Arnoldi<br />
Parallel <strong>SuperLU</strong> to solve the shifted linear system<br />
X. Li<br />
40
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