Demonstration of the suitability of GPUs for AO real-time control at ELT scales

Urban Bitenc; Alastair G. Basden; Nigel A. Dipper; Richard M. Myers

doi:10.1117/12.2234273

27 July 2016 Demonstration of the suitability of GPUs for AO real-time control at ELT scales

Urban Bitenc, Alastair G. Basden, Nigel A. Dipper, Richard M. Myers

Proceedings Volume 9909, Adaptive Optics Systems V; 99094S (2016) https://doi.org/10.1117/12.2234273
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

We have implemented the full AO data-processing pipeline on Graphics Processing Units (GPUs), within the framework of Durham AO Real-time Controller (DARC). The wavefront sensor images are copied from the CPU memory to the GPU memory. The GPU processes the data and the DM commands are copied back to the CPU. For a SCAO system of 80x80 subapertures, the rate achieved on a single GPU is about 700 frames per second (fps). This increases to 1100 fps (1565 fps) if we use two (four) GPUs. Jitter exhibits a distribution with the root-mean-square value of 20 μs–30 μs and a negligible number of outliers. The increase in latency due to the pixel data copying from the CPU to the GPU has been reduced to the minimum by copying the data in parallel to processing them. An alternative solution in which the data would be moved from the camera directly to the GPU, without CPU involvement, could be about 10%–20% faster. We have also implemented the correlation centroiding algorithm, which - when used - reduces the frame rate by about a factor of 2–3.

Citation Download Citation

Urban Bitenc, Alastair G. Basden, Nigel A. Dipper, and Richard M. Myers "Demonstration of the suitability of GPUs for AO real-time control at ELT scales", Proc. SPIE 9909, Adaptive Optics Systems V, 99094S (27 July 2016); https://doi.org/10.1117/12.2234273

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available