SIMULATeQCD: A simple multi-GPU lattice code for QCD calculations

Abstract

The rise of exascale supercomputers has fueled competition among GPU vendors, driving lattice QCD developers to write code that supports multiple APIs. Moreover, new developments in algorithms and physics research require frequent updates to existing software. These challenges have to be balanced against constantly changing personnel. At the same time, there is a wide range of applications for HISQ fermions in QCD studies. This situation encourages the development of software featuring a HISQ action that is flexible, high-performing, open source, easy to use, and easy to adapt. In this technical paper, we explain the design strategy, provide implementation details, list available algorithms and modules, and show key performance indicators for SIMULATeQCD, a simple multi-GPU lattice code for large-scale QCD calculations, mainly developed and used by the HotQCD collaboration. The code is publicly available on GitHub.

17 pages, 7 figures

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• Streamlined data analysis in Python
• Lattice QCD estimates of thermal photon production from the QGP
• Lattice $B$-field correlators for heavy quarks
• Searching for the QCD critical point using Lee-Yang edge singularities
• Chiral condensates and screening masses of neutral pseudoscalar mesons from lattice QCD at physical quark masses
• Temperature Dependence of Heavy Quark Diffusion from (2+1)-flavor Lattice QCD
• Thermodynamics of charmed hadrons across chiral crossover from lattice QCD
• Chiral Properties of $(2+1)$-Flavor QCD in Magnetic Fields at Zero Temperature
• Finite Temperature Quarkonia Spectral Functions in the Pseudoscalar Channel
• Shear and bulk viscosities of the gluon plasma across the transition temperature from lattice QCD