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perf: Parallelize siteRDF with ProductIterator #1882

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perf: Parallelize siteRDF with ProductIterator #1882

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This adds a ProductIterator class that enables iterating over two separate indices. As a bit of a refresher:

  • PairIterator looks at distinct pairs from a single source set
  • ZipIterator examines pairs of indices for different iterators joined together, so each index is seen once.
  • ProductIterator examines every possible combination of indices from two different sources.

We then use this product iterator to parallelise the siteRDF calculation.

@rprospero rprospero changed the title pref: Parallelize siteRDF with ProductIterator perf: Parallelize siteRDF with ProductIterator Apr 23, 2024
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