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https://issues.apache.org/jira/browse/LUCENE-10061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17439028#comment-17439028
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Zach Chen commented on LUCENE-10061:
------------------------------------
Hi [~jpountz], I've implemented a quick optimization to replace combinatorial
calculation with an upper-bound approximation
([commit|https://github.com/apache/lucene/pull/418/commits/2ba435e5c83f870be95662c951c9818111843a59])
.
With this and other bug fixes / optimizations based on CPU profiler, I was able
to get the following performance test results (perf test index rebuilt to
enable norm for title field, task file attached, and luceneutil integration
available at
[https://github.com/mikemccand/luceneutil/pull/148):|https://github.com/mikemccand/luceneutil/pull/148:]
{code:java}
Run 1
TaskQPS baseline StdDevQPS my_modified_version
StdDev Pct diff p-value
CFQHighHighHigh 4.64 (6.5%) 3.30
(4.7%) -29.0% ( -37% - -19%) 0.000
CFQHighHigh 11.09 (6.0%) 9.61
(6.0%) -13.3% ( -23% - -1%) 0.000
PKLookup 103.38 (4.4%) 108.04
(4.3%) 4.5% ( -4% - 13%) 0.001
CFQHighMedLow 10.58 (6.1%) 12.30
(8.7%) 16.2% ( 1% - 33%) 0.000
CFQHighMed 10.70 (7.4%) 15.51
(11.2%) 44.9% ( 24% - 68%) 0.000
CFQHighLowLow 8.18 (8.2%) 12.87
(11.6%) 57.3% ( 34% - 84%) 0.000
CFQHighLow 14.57 (7.5%) 30.81
(15.1%) 111.4% ( 82% - 144%) 0.000
Run 2
TaskQPS baseline StdDevQPS my_modified_version
StdDev Pct diff p-value
CFQHighHighHigh 5.33 (5.7%) 4.02
(7.7%) -24.4% ( -35% - -11%) 0.000
CFQHighLowLow 17.14 (6.2%) 13.06
(5.4%) -23.8% ( -33% - -13%) 0.000
CFQHighMed 17.37 (5.8%) 14.38
(7.7%) -17.2% ( -29% - -3%) 0.000
PKLookup 103.57 (5.5%) 108.84
(5.9%) 5.1% ( -6% - 17%) 0.005
CFQHighMedLow 11.25 (7.2%) 12.70
(9.0%) 12.9% ( -3% - 31%) 0.000
CFQHighHigh 5.00 (6.2%) 7.54
(12.1%) 51.0% ( 30% - 73%) 0.000
CFQHighLow 21.60 (5.2%) 34.57
(14.1%) 60.0% ( 38% - 83%) 0.000
Run 3
TaskQPS baseline StdDevQPS my_modified_version
StdDev Pct diff p-value
CFQHighHighHigh 5.40 (6.9%) 4.06
(5.1%) -24.8% ( -34% - -13%) 0.000
CFQHighMedLow 7.64 (7.4%) 5.79
(6.3%) -24.2% ( -35% - -11%) 0.000
CFQHighHigh 11.11 (7.0%) 9.60
(5.9%) -13.6% ( -24% - 0%) 0.000
CFQHighLowLow 21.21 (7.6%) 21.22
(6.6%) 0.0% ( -13% - 15%) 0.993
PKLookup 103.15 (5.9%) 107.60
(6.9%) 4.3% ( -8% - 18%) 0.034
CFQHighLow 21.85 (8.1%) 34.18
(13.5%) 56.4% ( 32% - 84%) 0.000
CFQHighMed 12.07 (8.4%) 19.98
(16.7%) 65.5% ( 37% - 98%) 0.000
Run 4
TaskQPS baseline StdDevQPS my_modified_version
StdDev Pct diff p-value
CFQHighHigh 8.50 (5.8%) 6.85
(5.2%) -19.5% ( -28% - -8%) 0.000
CFQHighMedLow 10.89 (5.7%) 8.96
(5.4%) -17.8% ( -27% - -7%) 0.000
CFQHighMed 8.41 (5.8%) 7.74
(5.6%) -7.9% ( -18% - 3%) 0.000
CFQHighHighHigh 3.45 (6.7%) 3.38
(5.3%) -2.0% ( -13% - 10%) 0.287
CFQHighLowLow 7.82 (6.4%) 8.20
(7.5%) 4.8% ( -8% - 20%) 0.030
PKLookup 103.50 (5.0%) 110.69
(5.4%) 6.9% ( -3% - 18%) 0.000
CFQHighLow 11.46 (6.0%) 13.16
(6.7%) 14.8% ( 1% - 29%) 0.000
{code}
I think overall this shows that the pruning will be most effective when there's
a significant difference between terms' frequencies, but will slow things down
if they are close, as the cost of pruning outweighs the efficacy of skipping.
I'm wondering if we should then gate the pruning by checking the frequencies as
well, but from some quick trials that seems to be an expensive operation? Do
you have any recommendation for this scenario?
> CombinedFieldsQuery needs dynamic pruning support
> -------------------------------------------------
>
> Key: LUCENE-10061
> URL: https://issues.apache.org/jira/browse/LUCENE-10061
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Adrien Grand
> Priority: Minor
> Attachments: CombinedFieldQueryTasks.wikimedium.10M.nostopwords.tasks
>
> Time Spent: 0.5h
> Remaining Estimate: 0h
>
> CombinedFieldQuery's Scorer doesn't implement advanceShallow/getMaxScore,
> forcing Lucene to collect all matches in order to figure the top-k hits.
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