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lattice / quda

QUDA is a library for performing calculations in lattice QCD on GPUs.
https://lattice.github.io/quda
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Add a block CG solver #316

Closed maddyscientist closed 6 years ago

maddyscientist commented 9 years ago

I've had a request (from Yoshinobu Nakamura) for a block CG solver, specifically a block multi-shift CG solver. This is for RHMC simulations where multiple pseudo fermions are used using nroots. Acceleration is gained through the use of a block solver which reduces the total iteration count. If we implemented a block solver, this could be combined with a multi-rhs dslash for both improved convergance and raw GFLOPS.

A block solver for BiCGstab is described here (http://arxiv.org/abs/1104.0737), with CG and the additional orthogonalization required for stability described in the references therein.

mathiaswagner commented 6 years ago

Guess we consider this done for CG now.