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https://issues.apache.org/jira/browse/LUCENE-9071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16984267#comment-16984267
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Adrien Grand commented on LUCENE-9071:
--------------------------------------
I'm getting a small but consistently reproducible speedup for boolean/term
queries, so I believe it is not noise. Here is the output of one run on
wikibigall for instance:
{noformat}
TaskQPS baseline StdDev QPS patch StdDev
Pct diff
SpanNear 1.37 (20.9%) 1.36 (20.7%)
-0.5% ( -34% - 51%)
PKLookup 195.89 (3.5%) 195.36 (3.8%)
-0.3% ( -7% - 7%)
Prefix3 59.17 (6.7%) 59.13 (6.6%)
-0.1% ( -12% - 14%)
HighTermDayOfYearSort 46.46 (5.8%) 46.44 (6.1%)
-0.1% ( -11% - 12%)
HighTermMonthSort 65.80 (12.4%) 65.80 (12.3%)
-0.0% ( -22% - 28%)
Fuzzy1 160.52 (12.7%) 160.58 (13.2%)
0.0% ( -22% - 29%)
IntervalsOrdered 10.76 (3.3%) 10.76 (3.2%)
0.1% ( -6% - 6%)
Wildcard 101.27 (3.7%) 101.33 (4.2%)
0.1% ( -7% - 8%)
SloppyPhrase 6.32 (7.2%) 6.33 (7.2%)
0.1% ( -13% - 15%)
Fuzzy2 80.13 (8.3%) 80.42 (9.2%)
0.4% ( -15% - 19%)
AndHighOrMedMed 37.69 (2.2%) 37.90 (1.9%)
0.6% ( -3% - 4%)
Phrase 10.95 (2.5%) 11.03 (2.4%)
0.8% ( -4% - 5%)
AndMedOrHighHigh 28.77 (2.7%) 29.14 (3.1%)
1.3% ( -4% - 7%)
IntNRQ 92.24 (3.1%) 94.13 (3.4%)
2.1% ( -4% - 8%)
AndHighMed 51.84 (3.0%) 52.92 (3.3%)
2.1% ( -4% - 8%)
Term 1375.94 (2.3%) 1405.17 (3.1%)
2.1% ( -3% - 7%)
OrHighMed 71.51 (2.3%) 73.32 (2.9%)
2.5% ( -2% - 7%)
OrHighHigh 86.33 (2.2%) 89.26 (3.0%)
3.4% ( -1% - 8%)
AndHighHigh 36.11 (2.9%) 37.34 (3.9%)
3.4% ( -3% - 10%)
{noformat}
> Speed up computation of BM25 scores
> -----------------------------------
>
> Key: LUCENE-9071
> URL: https://issues.apache.org/jira/browse/LUCENE-9071
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Time Spent: 10m
> Remaining Estimate: 0h
>
> We changed the way BM25 scores are computed in LUCENE-7997 in order to
> guarantee monotonicity of scores, but this translated to a small decrease of
> throughput, see annotation CC (October 2017) on Mike's nightly benchmarks.
> Even though the total number of score computations has decreased since we
> introduced block-max WAND, its relative cost is not negligible since we not
> only compute scores on collected documents, but also when decoding skip lists
> in order to compute the maximum score per block, or group of blocks.
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