iverase opened a new pull request, #14358:
URL: https://github.com/apache/lucene/pull/14358
While looking into some heap dumps, I notice in the
DirectMonotonicReader.Meta objects hold by segments that the case of single
value block is actually common. I wondered if we could specialize that case so
we can create a faster, light weigh single block version.
This commit makes DirectMonotonicReader a sealed abstractions with two
possible implementations, one for multi-blocks and the other for single blocks.
The multi-block implementation is very similar to the current implementation
while the single block is more lightweight as it does not need to be holding
arrays. The only side effect is that DirectMonotonicReader is bimorphic now,
but that should be ok.
I ran luceneutil and didnt' see much change:
```
TaskQPS baseline StdDevQPS
my_modified_version StdDev Pct diff p-value
OrHighNotMed 168.35 (4.3%) 163.80
(4.9%) -2.7% ( -11% - 6%) 0.064
HighTermTitleSort 36.96 (2.4%) 36.04
(4.2%) -2.5% ( -8% - 4%) 0.023
PKLookup 105.78 (6.1%) 103.28
(8.4%) -2.4% ( -15% - 12%) 0.306
HighTerm 228.90 (4.3%) 223.90
(5.3%) -2.2% ( -11% - 7%) 0.154
OrHighLow 330.01 (3.9%) 324.79
(3.5%) -1.6% ( -8% - 6%) 0.181
LowSpanNear 32.10 (6.5%) 31.61
(6.9%) -1.5% ( -13% - 12%) 0.469
Wildcard 103.26 (5.3%) 101.68
(7.1%) -1.5% ( -13% - 11%) 0.443
HighSpanNear 4.70 (4.7%) 4.63
(4.6%) -1.5% ( -10% - 8%) 0.309
OrNotHighLow 451.15 (3.5%) 444.47
(4.0%) -1.5% ( -8% - 6%) 0.215
HighSloppyPhrase 4.71 (4.8%) 4.64
(5.7%) -1.4% ( -11% - 9%) 0.415
Fuzzy2 36.81 (4.8%) 36.31
(5.9%) -1.4% ( -11% - 9%) 0.423
Fuzzy1 40.34 (2.9%) 39.81
(4.1%) -1.3% ( -8% - 5%) 0.233
OrHighHigh 75.21 (5.2%) 74.22
(5.1%) -1.3% ( -11% - 9%) 0.418
AndHighHigh 59.33 (5.0%) 58.57
(5.1%) -1.3% ( -10% - 9%) 0.426
AndHighMed 131.70 (3.2%) 130.05
(4.1%) -1.2% ( -8% - 6%) 0.286
range 2006.77 (7.0%) 1983.01
(8.5%) -1.2% ( -15% - 15%) 0.630
MedTerm 333.14 (4.2%) 329.23
(5.2%) -1.2% ( -10% - 8%) 0.429
LowIntervalsOrdered 6.16 (5.8%) 6.09
(6.5%) -1.1% ( -12% - 11%) 0.564
OrHighNotHigh 206.93 (3.4%) 204.61
(4.4%) -1.1% ( -8% - 6%) 0.366
MedSpanNear 15.36 (2.9%) 15.20
(3.7%) -1.0% ( -7% - 5%) 0.323
OrHighMed 135.41 (3.2%) 134.25
(2.8%) -0.9% ( -6% - 5%) 0.373
LowTerm 528.68 (4.1%) 524.30
(4.8%) -0.8% ( -9% - 8%) 0.556
OrHighNotLow 238.88 (4.2%) 237.11
(4.7%) -0.7% ( -9% - 8%) 0.599
MedSloppyPhrase 38.80 (2.7%) 38.55
(3.0%) -0.6% ( -6% - 5%) 0.483
MedIntervalsOrdered 43.96 (9.3%) 43.68
(9.2%) -0.6% ( -17% - 19%) 0.831
OrNotHighHigh 301.25 (2.5%) 299.46
(3.2%) -0.6% ( -6% - 5%) 0.520
HighIntervalsOrdered 7.35 (6.1%) 7.31
(6.8%) -0.5% ( -12% - 13%) 0.792
BrowseDayOfYearTaxoFacets 2.03 (13.2%) 2.02
(14.7%) -0.4% ( -25% - 31%) 0.920
OrNotHighMed 229.85 (2.8%) 228.86
(4.2%) -0.4% ( -7% - 6%) 0.701
BrowseDateTaxoFacets 2.01 (12.5%) 2.00
(15.0%) -0.4% ( -24% - 30%) 0.922
MedPhrase 77.28 (2.9%) 77.10
(3.1%) -0.2% ( -6% - 5%) 0.799
BrowseRandomLabelTaxoFacets 1.49 (12.2%) 1.49
(16.4%) -0.2% ( -25% - 32%) 0.960
Respell 22.59 (3.9%) 22.55
(4.1%) -0.1% ( -7% - 8%) 0.908
LowSloppyPhrase 76.40 (2.7%) 76.35
(3.2%) -0.1% ( -5% - 6%) 0.938
AndHighLow 478.69 (5.3%) 479.27
(7.1%) 0.1% ( -11% - 13%) 0.951
IntSet 253.58 (4.6%) 254.02
(5.8%) 0.2% ( -9% - 11%) 0.915
AndHighMedDayTaxoFacets 71.03 (2.9%) 71.30
(5.3%) 0.4% ( -7% - 8%) 0.780
BrowseMonthTaxoFacets 2.11 (11.6%) 2.12
(9.6%) 0.4% ( -18% - 24%) 0.902
HighTermMonthSort 640.17 (4.0%) 643.80
(4.9%) 0.6% ( -8% - 9%) 0.690
Prefix3 401.26 (8.0%) 403.59
(9.4%) 0.6% ( -15% - 19%) 0.834
BrowseMonthSSDVFacets 2.52 (13.7%) 2.54
(14.3%) 0.9% ( -23% - 33%) 0.837
HighPhrase 31.52 (3.0%) 31.83
(5.2%) 1.0% ( -7% - 9%) 0.465
HighTermTitleBDVSort 20.13 (3.8%) 20.33
(4.8%) 1.0% ( -7% - 9%) 0.455
LowPhrase 91.85 (4.1%) 93.07
(3.3%) 1.3% ( -5% - 9%) 0.258
BrowseDayOfYearSSDVFacets 2.54 (14.9%) 2.58
(14.7%) 1.3% ( -24% - 36%) 0.776
BrowseRandomLabelSSDVFacets 1.60 (8.3%) 1.63
(7.3%) 1.5% ( -13% - 18%) 0.555
IntNRQ 167.29 (4.0%) 169.92
(4.1%) 1.6% ( -6% - 10%) 0.220
AndHighHighDayTaxoFacets 11.05 (3.9%) 11.24
(3.7%) 1.8% ( -5% - 9%) 0.139
OrHighMedDayTaxoFacets 1.74 (4.6%) 1.77
(6.1%) 1.9% ( -8% - 13%) 0.268
TermDTSort 82.17 (4.0%) 84.11
(6.1%) 2.4% ( -7% - 13%) 0.148
MedTermDayTaxoFacets 9.83 (7.2%) 10.08
(4.2%) 2.5% ( -8% - 14%) 0.183
HighTermDayOfYearSort 72.30 (4.7%) 74.29
(5.7%) 2.8% ( -7% - 13%) 0.094
BrowseDateSSDVFacets 0.58 (13.0%) 0.61
(17.2%) 5.8% ( -21% - 41%) 0.227
```
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