Accelerating spherical harmonic transforms for a large number of sky maps
Instrumentation and Methods for Astrophysics
2022-11-18 v2 Cosmology and Nongalactic Astrophysics
Abstract
The spherical harmonic transform is a powerful tool in the analysis of spherical data sets, such as the cosmic microwave background data. In this work, we present a new scheme for the spherical harmonic transforms that supports both CPU and GPU computations, which is specially efficient on a large number of sky maps. By comparing our implementation with the standard Libsharp-HEALPix program, we demonstrate 2-10 times speedup for the CPU implementation, and up to 30 times speedup when a state-of-the-art GPU is employed. This new scheme's software package is available via an open source GitHub repository.
Keywords
Cite
@article{arxiv.2208.10154,
title = {Accelerating spherical harmonic transforms for a large number of sky maps},
author = {Chi Tian and Siyu Li and Hao Liu},
journal= {arXiv preprint arXiv:2208.10154},
year = {2022}
}
Comments
Open access. The software package is available at https://github.com/liuhao-cn/fastSHT