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Anserini: Lucene 7 vs. Lucene 8

Experiments performed in late April 2019 on an Intel E5-2699 v4 @ 2.20GHz processor, single thread. Query evaluation latency on the ClueWeb12-B13 collection, running the first 10k queries from the TREC 2005 Terabyte Track efficiency queries:

Hits Lucene 7.6 Lucene 8.0 speedup
10 hits 2885s 654s ~3.5
100 hits 3209s 1161s ~2.8
1000 hits 5691s 4050s ~1.4

Results are averaged over three trials, after discarding a warmup run.

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