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In the age of big data, many graph algorithms are now required to operate in external memory and deliver performance that does not significantly degrade with the scale of the problem. One particular area that frequently deals with graphs larger than RAM is triangle listing, where the algorithms must carefully piece together edges from multiple partitions to detect cycles. In recent literature, two...
Discovering triangles in large graphs is a well-studied area, however, both external-memory performance of existing methods and our understanding of the complexity involved leave much room for improvement. To shed light on this problem, we first generalize the existing in-memory algorithms into a single framework of 18 triangle-search techniques. We then develop a novel external-memory approach, which...
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