Results of the NFIRAOS RTC trade study

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Proceedings titleSPIE - International Society for Optical Engineering. Proceedings
ConferenceAdaptive Optics Systems IV, 22 June 2014 through 27 June 2014
Article number91482F
SubjectBenchmarking; Computer hardware; Matrix algebra; Program processors; Real time control; Wavefronts; Base-line architecture; Commercial off the shelves; Generic architecture; Large deformable mirrors; Matrix vector multiply; Parallel implementations; Real time computing; Wave front reconstruction; Adaptive optics
AbstractWith two large deformable mirrors with a total of more than 7000 actuators that need to be driven from the measurements of six 60x60 LGS WFSs (total 1.23Mpixels) at 800Hz with a latency of less than one frame, NFIRAOS presents an interesting real-time computing challenge. This paper reports on a recent trade study to evaluate which current technology could meet this challenge, with the plan to select a baseline architecture by the beginning of NFIRAOS construction in 2014. We have evaluated a number of architectures, ranging from very specialized layouts with custom boards to more generic architectures made from commercial off-the-shelf units (CPUs with or without accelerator boards). For each architecture, we have found the most suitable algorithm, mapped it onto the hardware and evaluated the performance through benchmarking whenever possible. We have evaluated a large number of criteria, including cost, power consumption, reliability and flexibility, and proceeded with scoring each architecture based on these criteria. We have found that, with today's technology, the NFIRAOS requirements are well within reach of off-the-shelf commercial hardware running a parallel implementation of the straightforward matrix-vector multiply (MVM) algorithm for wave-front reconstruction. Even accelerators such as GPUs and Xeon Phis are no longer necessary. Indeed, we have found that the entire NFIRAOS RTC can be handled by seven 2U high-end PC-servers using 10GbE connectivity. Accelerators are only required for the off-line process of updating the matrix control matrix every ∼10s, as observing conditions change.
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AffiliationNational Research Council Canada; National Science Infrastructure
Peer reviewedYes
NPARC number21275608
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Record identifier8e5df2d5-8106-40f4-8433-8b8b003cb1c6
Record created2015-07-14
Record modified2017-04-24
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