Journal Article

Enabling parallel computing in <span class="smallCaps">crash</span>

A. M. Partl, A. Maselli, B. Ciardi, A. Ferrara and V. Müller

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 414, issue 1, pages 428-444
Published in print June 2011 | ISSN: 0035-8711
Published online June 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18401.x
Enabling parallel computing in crash

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We present the new parallel version (pcrash2) of the cosmological radiative transfer code crash2 for distributed memory supercomputing facilities. The code is based on a static domain decomposition strategy inspired by geometric dilution of photons in the optical thin case that ensures a favourable performance speed-up with an increasing number of computational cores. Linear speed-up is ensured as long as the number of radiation sources is equal to the number of computational cores or larger. The propagation of rays is segmented and rays are only propagated through one sub-domain per time-step to guarantee an optimal balance between communication and computation. We have extensively checked pcrash2 with a standardized set of test cases to validate the parallelization scheme. The parallel version of crash2 can easily handle the propagation of radiation from a large number of sources and is ready for the extension of the ionization network to species other than hydrogen and helium.

Keywords: radiative transfer; methods: numerical; intergalactic medium; cosmology: theory

Journal Article.  11965 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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