CUDAEASY - a GPU Accelerated Cosmological Lattice Program

TL;DR

CUDAEASY is a GPU-accelerated program for simulating scalar field evolution in cosmology, achieving 10-100x speedups over traditional CPU-based methods, enabling faster and more efficient lattice simulations.

Contribution

This paper introduces the first GPU-accelerated cosmological lattice simulation program, CUDAEASY, significantly improving computational speed and efficiency.

Findings

Speedups of 10 to 100 times compared to CPU implementations

Simulations that took a day now complete in hours

Small errors achieved with single precision computations

Abstract

This paper presents, to the author's knowledge, the first graphics processing unit (GPU) accelerated program that solves the evolution of interacting scalar fields in an expanding universe. We present the implementation in NVIDIA's Compute Unified Device Architecture (CUDA) and compare the performance to other similar programs in chaotic inflation models. We report speedups between one and two orders of magnitude depending on the used hardware and software while achieving small errors in single precision. Simulations that used to last roughly one day to compute can now be done in hours and this difference is expected to increase in the future. The program has been written in the spirit of LATTICEEASY and users of the aforementioned program should find it relatively easy to start using CUDAEASY in lattice simulations. The program is available at http://www.physics.utu.fi/theory/particlecosmology/cudaeasy/ under the GNU General Public License.