1112.4533 (Nuno Cardoso et al.)

Generating SU(Nc) pure gauge lattice QCD configurations on GPUs with
CUDA and OpenMP    [PDF]

Nuno Cardoso, Pedro Bicudo

The starting point of any lattice QCD computation is the generation of a
Markov chain of gauge field configurations. Due to the large number of lattice
links and due to the matrix multiplications, generating SU(Nc) lattice QCD
configurations is a highly demanding computational task, requiring advanced
computer parallel architectures such as clusters of several Central Processing
Units (CPUs) or Graphics Processing Units (GPUs). In this paper we present and
explore the performance of CUDA codes for NVIDIA GPUs to generate SU(Nc)
lattice QCD pure gauge configurations. Our implementation in one GPU uses CUDA
and in multiple GPUs uses OpenMP and CUDA. We present optimized CUDA codes
SU(2), SU(3) and SU(4). We also show a generic SU(Nc) code for Nc$\,\geq 4$ and
compare it with the optimized version of SU(4). Our codes are publicly
available for free use by the lattice QCD community.

View original: http://arxiv.org/abs/1112.4533