- Main
BEYONDPLANCK
- Galloway, M;
- Andersen, KJ;
- Aurlien, R;
- Banerji, R;
- Bersanelli, M;
- Bertocco, S;
- Brilenkov, M;
- Carbone, M;
- Colombo, LPL;
- Eriksen, HK;
- Eskilt, JR;
- Foss, MK;
- Franceschet, C;
- Fuskeland, U;
- Galeotta, S;
- Gerakakis, S;
- Gjerløw, E;
- Hensley, B;
- Herman, D;
- Iacobellis, M;
- Ieronymaki, M;
- Ihle, HT;
- Jewell, JB;
- Karakci, A;
- Keihänen, E;
- Keskitalo, R;
- Maggio, G;
- Maino, D;
- Maris, M;
- Mennella, A;
- Paradiso, S;
- Partridge, B;
- Reinecke, M;
- San, M;
- Suur-Uski, A-S;
- Svalheim, TL;
- Tavagnacco, D;
- Thommesen, H;
- Watts, DJ;
- Wehus, IK;
- Zacchei, A
- et al.
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.
Main Content
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