DiFX2: A more flexible, efficient, robust and powerful software correlator
A.T. Deller, W.F. Brisken, C.J. Phillips, J. Morgan, W. Alef, R., Cappallo, E. Middelberg, J. Romney, H. Rottmann, S.J. Tingay, R. Wayth

TL;DR
DiFX2 is an upgraded, flexible, and efficient software correlator for radio interferometry, offering new capabilities, performance improvements, and ease of use for small to medium-sized arrays.
Contribution
The paper details the new features, performance enhancements, and infrastructure support added to DiFX correlator over three years, improving its functionality and efficiency.
Findings
At least 15% faster than previous version
Supports correlation of many phase centers in one pass
Validated correctness of new code through detailed tests
Abstract
Software correlation, where a correlation algorithm written in a high-level language such as C++ is run on commodity computer hardware, has become increasingly attractive for small to medium sized and/or bandwidth constrained radio interferometers. In particular, many long baseline arrays (which typically have fewer than 20 elements and are restricted in observing bandwidth by costly recording hardware and media) have utilized software correlators for rapid, cost-effective correlator upgrades to allow compatibility with new, wider bandwidth recording systems and improve correlator flexibility. The DiFX correlator, made publicly available in 2007, has been a popular choice in such upgrades and is now used for production correlation by a number of observatories and research groups worldwide. Here we describe the evolution in the capabilities of the DiFX correlator over the past three…
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Taxonomy
TopicsRadio Astronomy Observations and Technology · Soil Moisture and Remote Sensing · Superconducting and THz Device Technology
