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2017 GTC San Jose

S7125 - Efficient Imaging in Radio Astronomy Using GPUs

Session Speakers
Session Description

Realizing the next generation of radio telescopes such as the Square Kilometre Array requires both more efficient hardware and algorithms than today's technology provides. We'll present our work on the recently introduced Image-Domain Gridding (IDG) algorithm that tries to avoid the performance bottlenecks of traditional AW-projection gridding. We'll demonstrate how we implemented this algorithm on various architectures. By applying a modified roofline analysis, we show that our parallelization approaches and optimization leads to nearly optimal performance on all architectures. The analysis also indicates that, by leveraging dedicated hardware to evaluate trigonometric functions, NVIDIA GPUs are much faster and more energy-efficient than regular CPUs. This makes IDG on GPUs a candidate for meeting the computational and energy-efficiency constraints for future telescopes.


Additional Session Information
Intermediate
Talk
Astronomy and Astrophysics Performance Optimization
Government / National Labs Higher Education / Research
25 minutes
Session Schedule