# Multigrid for Wilson Clover Fermions in Grid

## TL;DR

This paper presents a multigrid solver for Wilson clover fermions implemented in the Grid library, emphasizing performance portability across diverse computing architectures in Lattice QCD simulations.

## Contribution

It introduces a new multigrid solver for Wilson clover fermions within the Grid framework, highlighting implementation details and initial performance optimizations.

## Key findings

- The solver supports multiple architectures with performance portability.
- Initial optimizations improve multigrid solver efficiency.
- Comparison shows competitive performance with existing implementations.

## Abstract

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.