: That’s a very odd drop. The only lucene commit that happened around : then is LUCENE-8018, which really shouldn’t be making a difference to : query performance. And there’s no change to the PhraseQuery graphs.
Each run records the Git SHA it was run against -- the dip that's been noted was beteen these 2 runs... https://home.apache.org/~mikemccand/lucenebench/2017.10.24.22.16.06.html Lucene/Solr trunk rev 81a4f7cc9cebf9c75387b1b498b556f6aa799932 luceneutil rev 09a663e8054625f5173a92a21c9dd82c5a753dd7 https://home.apache.org/~mikemccand/lucenebench/2017.10.27.22.16.00.html Lucene/Solr trunk rev f1a6b68d75e58f464b2ed4ee3702a6c1b14511a0 luceneutil rev 09a663e8054625f5173a92a21c9dd82c5a753dd7 (although to be honest, i really don't understand the "stats" listed on those URLs -- the "QPS prev" vs the "QPS now" doen't seem to match the graph plot data for the same two dates -- so perhaps there is a reporting glitch in what's actaully been tested in each run?) Assuming those SHAs are correct, there are 2 other candidate commits besides LUCENE-8018 (see below) I'm not very familiar with exactly what code is run by each of these benchmarks, but is it possible the Similarity changes in LUCENE-7997 had an impact? IIUC some stats/calculations were changed from floats to doubles ... could that change account for this? -Hoss http://www.lucidworks.com/ hossman@tray:~/lucene/dev [master] $ git log 81a4f7cc9cebf9c75387b1b498b556f6aa799932..f1a6b68d75e58f464b2ed4ee3702a6c1b14511a0 lucene/ commit 401dda7e064b6f621cba405985143724d79620c4 Author: Adrien Grand <[email protected]> Date: Fri Oct 27 08:36:27 2017 +0200 LUCENE-8018: FieldInfos retains garbage if non-sparse. commit 7d9cf438730e9cb7e251d1d2f5c6e81eba456f5c Author: Steve Rowe <[email protected]> Date: Thu Oct 26 17:12:26 2017 -0400 Add 6.6.2 back compat test indexes. commit 42717d5f4bbed46009f11a86f307541a19fd7fb5 Author: Robert Muir <[email protected]> Date: Tue Oct 24 22:48:04 2017 -0400 LUCENE-7997: More sanity testing of similarities
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