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Software correlation, where a correlation algorithm written in a high-levellanguage such as C++ is run on commodity computer hardware, has becomeincreasingly attractive for small to medium sized and/or bandwidth constrainedradio interferometers. In particular, many long baseline arrays (whichtypically have fewer than 20 elements and are restricted in observing bandwidthby costly recording hardware and media) have utilized software correlators forrapid, cost-effective correlator upgrades to allow compatibility with new,wider bandwidth recording systems and improve correlator flexibility. The DiFXcorrelator, made publicly available in 2007, has been a popular choice in suchupgrades and is now used for production correlation by a number ofobservatories and research groups worldwide. Here we describe the evolution inthe capabilities of the DiFX correlator over the past three years, including anumber of new capabilities, substantial performance improvements, and a largeamount of supporting infrastructure to ease use of the code. New capabilitiesinclude the ability to correlate a large number of phase centers in a singlecorrelation pass, the extraction of phase calibration tones, correlation ofdisparate but overlapping sub-bands, the production of rapidly sampledfilterbank and kurtosis data at minimal cost, and many more. The latest versionof the code is at least 15% faster than the original, and in certain situationsmany times this value. Finally, we also present detailed test resultsvalidating the correctness of the new code.

DiFX2: A more flexible, efficient, robust and powerful software correlator