An SVD-based rank-k truncation of chirally split test vectors reduces Wilson fermion multigrid solve times on HSC and MILC ensembles.
DDalphaAMG for Twisted Mass Fermions
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abstract
We present the Adaptive Aggregation-based Domain Decomposition Multigrid method extended to the twisted mass fermion discretization action. We show comparisons of results as a function of tuning the parameters that enter the twisted mass version of the DDalphaAMG library (https://github.com/sbacchio/DDalphaAMG). Moreover, we linked the DDalphaAMG library to the tmLQCD software package and give details on the performance of the multigrid solver during HMC simulations at the physical point.
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Chiral rank-$k$ truncations for the multigrid preconditioner of Wilson fermions in lattice QCD
An SVD-based rank-k truncation of chirally split test vectors reduces Wilson fermion multigrid solve times on HSC and MILC ensembles.