Meeting the Real-Time Challenges of Ground-Based Telescopes Using Low-Rank Matrix Computations

Hatem Ltaief, Jesse Cranney, Damien Gratadour, Yuxi Hong, Laurent Gatineau, David E. Keyes

Research output: Chapter in Book/Report/Conference proceedingConference contribution

10 Scopus citations


Adaptive Optics (AO) is a technology that permits to measure and mitigate the distortion effects of atmospheric turbulence on optical beams. AO must operate in real-Time by controlling thousands of actuators to shape the surface of deformable mirrors deployed on ground-based telescopes to compensate for these distortions. The command vectors that trigger how each individual actuator should act to bend a portion of the mirror are obtained from Matrix-Vector Multiplications (MVM). We identify and leverage the data sparsity structure of these control matrices coming from the MAVIS instruments for the European Southern Observatory s Very Large Telescope. We provide performance evaluation on x86 and acceleratorbased systems.We present the impact of tile low-rank (TLR) matrix approximations on time-To-solution for the MVM and assess the produced image quality. We achieve performance improvement up to two orders of magnitude for TLR-MVM compared to regular dense MVM, while maintaining the image quality.
Original languageEnglish (US)
Title of host publicationProceedings of the International Conference for High Performance Computing, Networking, Storage and Analysis
ISBN (Print)9781450384421
StatePublished - Nov 13 2021

Bibliographical note

KAUST Repository Item: Exported on 2022-02-11
Acknowledgements: ENTS The authors would like thank Fujitsu limited for their support on the evaluation environment and AMD/NVIDIA for the remote accesses steto their respective GPU-based systems.


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