Multigrid for Wilson Clover Fermions in Grid

Understand

With the ever-growing number of computing architectures, performance portability is an important aspect of (Lattice QCD) software.

• The Grid library provides a good framework for writing such code, as it thoroughly separates hardware-specific code from algorithmic functionality and already supports many modern architectures.
• We describe the implementation of a multigrid solver for Wilson clover fermions in Grid by the RQCD group.
• We present the features included in our implementation, discuss initial optimization efforts, and compare the performance with another multigrid implementation.