Performance of the dot product function in radiative transfer code SORD

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https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10007/1000705/Performance-of-the-dot-product-function-in-radiative-transfer-code/10.1117/12.2240592.full

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https://doi.org/10.1117/12.2240592
 http://hdl.handle.net/11603/35945

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https://orcid.org/0000-0001-6514-5233
 https://orcid.org/0000-0003-1105-5739

Date

2016-10-24

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conference papers and proceedings
presentations (communicative events)
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Citation of Original Publication

Korkin, Sergey, Alexei Lyapustin, Aliaksandr Sinyuk, and Brent Holben. “Performance of the Dot Product Function in Radiative Transfer Code SORD.” In High-Performance Computing in Geoscience and Remote Sensing VI, 10007:28–34. SPIE, 2016. https://doi.org/10.1117/12.2240592.

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THIS WORK WAS WRITTEN AS PART OF ONE OF THE AUTHOR'S OFFICIAL DUTIES AS AN EMPLOYEE OF THE UNITED STATES GOVERNMENT AND IS THEREFORE A WORK OF THE UNITED STATES GOVERNMENT. IN ACCORDANCE WITH 17 U.S.C. 105, NO COPYRIGHT PROTECTION IS AVAILABLE FOR SUCH WORKS UNDER U.S. LAW.
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Abstract

The successive orders of scattering radiative transfer (RT) codes frequently call the scalar (dot) product function. In this paper, we study performance of some implementations of the dot product in the RT code SORD using 50 scenarios for light scattering in the atmosphere-surface system. In the dot product function, we use the unrolled loops technique with different unrolling factor. We also considered the intrinsic Fortran functions. We show results for two machines: ifort compiler under Windows, and pgf90 under Linux. Intrinsic DOT_PRODUCT function showed best performance for the ifort. For the pgf90, the dot product implemented with unrolling factor 4 was the fastest.The RT code SORD together with the interface that runs all the mentioned tests are publicly available from ftp://maiac.gsfc.nasa.gov/pub/skorkin/SORD_IP_16B (current release) or by email request from the corresponding (first) author.