BEYOND P LANCK: III. Commander3

Journal
Date Issued
2023
Author(s)
Galloway, M.
•
Andersen, K. J.
•
Aurlien, R.
•
Banerji, R.
•
Bersanelli, M.
•
•
Brilenkov, M.
•
Carbone, M.
•
Colombo, L. P.L.
•
Eriksen, H. K.
•
Eskilt, J. R.
•
Foss, M. K.
•
Franceschet, C.
•
Fuskeland, U.
•
•
Gerakakis, S.
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Gjerløw, E.
•
Hensley, B.
•
Herman, D.
•
Iacobellis, M.
•
Ieronymaki, M.
•
Ihle, H. T.
•
Jewell, J. B.
•
Karakci, A.
•
Keihänen, E.
•
Keskitalo, R.
•
•
Maino, D.
•
•
Mennella, A.
•
Paradiso, S.
•
Partridge, B.
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Reinecke, M.
•
San, M.
•
Suur-Uski, A. S.
•
Svalheim, T. L.
•
•
Thommesen, H.
•
Watts, D. J.
•
Wehus, I. K.
•
DOI
Abstract
We describe the computational infrastructure for end-to-end Bayesian cosmic microwave background (CMB) analysis implemented by the BeyondPlanck Collaboration. The code is called Commander3. It provides a statistically consistent framework for global analysis of CMB and microwave observations and may be useful for a wide range of legacy, current, and future experiments. The paper has three main goals. Firstly, we provide a high-level overview of the existing code base, aiming to guide readers who wish to extend and adapt the code according to their own needs or re-implement it from scratch in a different programming language. Secondly, we discuss some critical computational challenges that arise within any global CMB analysis framework, for instance in-memory compression of time-ordered data, fast Fourier transform optimization, and parallelization and load-balancing. Thirdly, we quantify the CPU and RAM requirements for the current BEYONDPLANCK analysis, finding that a total of 1.5 TB of RAM is required for efficient analysis and that the total cost of a full Gibbs sample for LFI is 170 CPU-hrs, including both low-level processing and high-level component separation, which is well within the capabilities of current low-cost computing facilities. The existing code base is made publicly available under a GNU General Public Library (GPL) license.
Funding(s)
Volume
675
Start page
A3
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2023A&A...675A...3G
Rights
open.access
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