# The Taming of QCD by Fortran 90

## TL;DR

This paper presents a comprehensive implementation of lattice QCD in Fortran 90, featuring modular, machine-independent code, efficient data storage, and parallel computing capabilities, enabling effective simulations on supercomputers.

## Contribution

The authors developed a modular, machine-independent Fortran 90 framework for lattice QCD with optimized data handling and parallel processing, enhancing simulation efficiency and portability.

## Key findings

- Successful implementation on supercomputers
- High performance in parallel and single processor modes
- Ease of writing QCD programs with new modules

## Abstract

We implement lattice QCD using the Fortran 90 language. We have designed machine independent modules that define fields (gauge, fermions, scalars, etc...) and have defined overloaded operators for all possible operations between fields, matrices and numbers. With these modules it is very simple to write QCD programs. We have also created a useful compression standard for storing the lattice configurations, a parallel implementation of the random generators, an assignment that does not require temporaries, and a machine independent precision definition. We have tested our program on parallel and single processor supercomputers obtaining excellent performances.