Extreme computing for extreme adaptive optics: The key to finding life outside our solar system

Hatem Ltaief, Dalal Sukkari, Olivier Guyon, David Keyes

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

1 Scopus citations

Abstract

The real-time correction of telescopic images in the search for exoplanets is highly sensitive to atmospheric aberrations. The pseudoinverse algorithm is an efficient mathematical method to filter out these turbulences.We introduce a new partial singular value decomposition (SVD) algorithm based on QR-based Diagonally Weighted Halley (QDWH) iteration for the pseudo-inverse method of adaptive optics. The QDWH partial SVD algorithm selectively calculates the most significant singular values and their corresponding singular vectors. We develop a high performance implementation and demonstrate the numerical robustness of the QDWH-based partial SVD method. We also perform a benchmarking campaign on various generations of GPU hardware accelerators and compare against the state-of-the-art SVD implementation SGESDD from the MAGMA library. Numerical accuracy and performance results are reported using synthetic and real observational datasets from the Subaru telescope. Our implementation outperforms SGESDD by up to fivefold and fourfold performance speedups on ill-conditioned synthetic matrices and real observational datasets, respectively. The pseudo-inverse simulation code will be deployed on-sky for the Subaru telescope during observation nights scheduled early 2018.

Original languageEnglish (US)
Title of host publicationProceedings of the Platform for Advanced Scientific Computing Conference, PASC 2018
PublisherAssociation for Computing Machinery, Inc
ISBN (Electronic)9781450358910
DOIs
Publication statusPublished - Jul 2 2018
Event5th Platform for Advanced Scientific Computing Conference, PASC 2018 - Basel, Switzerland
Duration: Jul 2 2018Jul 4 2018

Other

Other5th Platform for Advanced Scientific Computing Conference, PASC 2018
CountrySwitzerland
CityBasel
Period7/2/187/4/18

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Keywords

  • Adaptive optics
  • Computational astronomy
  • GPU computations
  • Partial SVD
  • Pseudo-inverse calculation
  • QDWH

ASJC Scopus subject areas

  • Computer Science Applications

Cite this

Ltaief, H., Sukkari, D., Guyon, O., & Keyes, D. (2018). Extreme computing for extreme adaptive optics: The key to finding life outside our solar system. In Proceedings of the Platform for Advanced Scientific Computing Conference, PASC 2018 [a1] Association for Computing Machinery, Inc. https://doi.org/10.1145/3218176.3218225