Cosmic microwave background map-making at the petascale and beyond

Rajesh Sudarsan, Julian Borrill, Christopher Cantalupo, Theodore Kisner, Kamesh Madduri, Leonid Oliker, Yili Zheng, Horst Simon

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


The analysis of Cosmic Microwave Background (CMB) observations is a long-standing computational challenge, driven by the exponential growth in the size of the data sets being gathered. Since this growth is projected to continue for at least the next decade, it will be critical to extend the analysis algorithms and their implementations to peta-scale high performance computing (HPC) systems and beyond. The most computationally intensive part of the analysis is generating and reducing Monte Carlo realizations of an experiment's data. In this work we take the current state-of-the-art simulation and mapping software and investigate its performance when pushed to tens of thousands of cores on a range of leading HPC systems, in particular focusing on the communication bottleneck that emerges at high concurrencies. We present a new communication strategy that removes this bottleneck, allowing for CMB analyses of unprecedented scale and hence fidelity. Experimental results show a communication speedup of up to 116x using our alternative strategy.

Original languageEnglish (US)
Title of host publicationICS'11 - Proceedings of the 2011 ACM International Conference on Supercomputing
Number of pages12
StatePublished - 2011
Event25th ACM International Conference on Supercomputing, ICS 2011 - Tucson, AZ, United States
Duration: May 31 2011Jun 4 2011

Publication series

NameProceedings of the International Conference on Supercomputing


Other25th ACM International Conference on Supercomputing, ICS 2011
Country/TerritoryUnited States
CityTucson, AZ

All Science Journal Classification (ASJC) codes

  • General Computer Science


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