javanna commented on PR #13542:
URL: https://github.com/apache/lucene/pull/13542#issuecomment-2332114836
Hey all, I have done some benchmarking with two main goals:
1) ensure there are no regressions introduced by the proposed change
2) ensure there is some performance gain when intra-segment is activated, as
basic as its support is in this initial proposed step.
I ran `wikimediumall` benchmarks with the default parameters and manually
added count queries to the tasks executed. The default search concurrency is
automatic, meaning it will create an executor based on the number of CPUs
available. The index is not force merged, there are multiple segments.
The first run is main (baseline) against my current branch
(my_modified_version):
TaskQPS baseline StdDevQPS
my_modified_version StdDev Pct diff p-value
CountTerm 4252.98 (6.3%) 3928.20
(5.2%) -7.6% ( -18% - 4%) 0.000
HighIntervalsOrdered 18.28 (5.7%) 17.80
(5.4%) -2.7% ( -12% - 8%) 0.129
CountOrHighMed 319.35 (5.3%) 311.55
(4.5%) -2.4% ( -11% - 7%) 0.118
HighTermMonthSort 1225.80 (3.8%) 1200.00
(5.3%) -2.1% ( -10% - 7%) 0.148
LowSpanNear 17.17 (5.3%) 16.89
(4.4%) -1.7% ( -10% - 8%) 0.280
MedIntervalsOrdered 62.72 (4.4%) 61.69
(5.7%) -1.6% ( -11% - 8%) 0.310
Fuzzy1 65.29 (6.7%) 64.36
(4.6%) -1.4% ( -11% - 10%) 0.431
MedTermDayTaxoFacets 17.35 (6.9%) 17.11
(7.0%) -1.4% ( -14% - 13%) 0.537
HighTermTitleBDVSort 19.73 (5.3%) 19.50
(4.1%) -1.2% ( -10% - 8%) 0.441
AndHighLow 954.69 (4.2%) 943.83
(4.1%) -1.1% ( -9% - 7%) 0.384
BrowseDayOfYearTaxoFacets 3.87 (8.4%) 3.83
(4.9%) -1.1% ( -13% - 13%) 0.603
BrowseDateTaxoFacets 3.83 (8.8%) 3.79
(5.9%) -1.1% ( -14% - 14%) 0.641
AndHighHighDayTaxoFacets 11.99 (4.9%) 11.86
(6.5%) -1.1% ( -11% - 10%) 0.556
LowPhrase 176.29 (3.3%) 174.85
(3.7%) -0.8% ( -7% - 6%) 0.460
BrowseRandomLabelTaxoFacets 3.20 (3.9%) 3.18
(4.3%) -0.8% ( -8% - 7%) 0.547
HighTermTitleSort 97.01 (5.0%) 96.30
(4.6%) -0.7% ( -9% - 9%) 0.628
HighTerm 410.73 (5.6%) 407.91
(7.1%) -0.7% ( -12% - 12%) 0.736
HighPhrase 68.29 (4.3%) 67.87
(4.0%) -0.6% ( -8% - 7%) 0.641
CountOrHighHigh 34.41 (25.3%) 34.22
(20.2%) -0.5% ( -36% - 60%) 0.942
OrHighNotHigh 326.55 (6.4%) 324.92
(5.6%) -0.5% ( -11% - 12%) 0.793
AndHighMed 232.64 (3.5%) 231.61
(4.8%) -0.4% ( -8% - 8%) 0.739
PKLookup 163.46 (8.6%) 162.75
(6.9%) -0.4% ( -14% - 16%) 0.860
OrNotHighLow 1042.34 (3.9%) 1039.01
(4.2%) -0.3% ( -8% - 8%) 0.803
HighSloppyPhrase 19.17 (4.4%) 19.12
(5.7%) -0.3% ( -9% - 10%) 0.855
BrowseMonthTaxoFacets 4.08 (5.0%) 4.07
(7.4%) -0.2% ( -11% - 12%) 0.908
HighSpanNear 17.99 (5.9%) 18.00
(6.0%) 0.0% ( -11% - 12%) 0.984
OrHighMedDayTaxoFacets 2.49 (7.3%) 2.50
(6.7%) 0.2% ( -12% - 15%) 0.936
OrNotHighMed 296.13 (5.0%) 297.20
(5.9%) 0.4% ( -9% - 11%) 0.833
OrHighMed 350.64 (4.2%) 352.22
(4.6%) 0.5% ( -8% - 9%) 0.748
MedPhrase 60.88 (3.8%) 61.18
(4.4%) 0.5% ( -7% - 8%) 0.695
CountAndHighMed 272.12 (3.4%) 273.55
(4.8%) 0.5% ( -7% - 9%) 0.691
Respell 35.73 (4.9%) 35.93
(6.7%) 0.6% ( -10% - 12%) 0.763
MedSloppyPhrase 19.80 (6.6%) 19.92
(7.3%) 0.6% ( -12% - 15%) 0.778
LowSloppyPhrase 17.75 (4.3%) 17.86
(3.7%) 0.6% ( -7% - 9%) 0.622
Prefix3 1050.17 (3.9%) 1057.01
(4.8%) 0.7% ( -7% - 9%) 0.636
Wildcard 143.63 (4.1%) 144.58
(4.3%) 0.7% ( -7% - 9%) 0.618
CountPhrase 13.59 (4.2%) 13.69
(4.3%) 0.7% ( -7% - 9%) 0.608
OrHighHigh 60.33 (8.5%) 60.77
(10.6%) 0.7% ( -16% - 21%) 0.810
OrNotHighHigh 311.92 (5.7%) 314.20
(5.2%) 0.7% ( -9% - 12%) 0.672
OrHighNotMed 389.61 (5.9%) 394.22
(5.1%) 1.2% ( -9% - 12%) 0.497
OrHighLow 640.22 (3.9%) 648.85
(5.0%) 1.3% ( -7% - 10%) 0.343
MedTerm 796.68 (6.3%) 807.58
(7.8%) 1.4% ( -11% - 16%) 0.542
LowTerm 779.26 (4.8%) 790.22
(4.2%) 1.4% ( -7% - 10%) 0.324
CountAndHighHigh 73.71 (5.1%) 74.75
(6.7%) 1.4% ( -9% - 13%) 0.453
LowIntervalsOrdered 76.85 (4.9%) 77.98
(5.9%) 1.5% ( -8% - 12%) 0.395
BrowseDateSSDVFacets 1.01 (8.6%) 1.03
(9.7%) 1.6% ( -15% - 21%) 0.584
AndHighMedDayTaxoFacets 17.64 (5.3%) 17.96
(4.7%) 1.8% ( -7% - 12%) 0.268
HighTermDayOfYearSort 474.18 (6.2%) 482.93
(5.1%) 1.8% ( -8% - 13%) 0.303
AndHighHigh 120.18 (5.4%) 122.60
(5.0%) 2.0% ( -7% - 13%) 0.219
MedSpanNear 94.97 (4.1%) 97.02
(4.6%) 2.2% ( -6% - 11%) 0.117
BrowseMonthSSDVFacets 5.99 (17.5%) 6.12
(11.0%) 2.3% ( -22% - 37%) 0.618
OrHighNotLow 611.75 (4.3%) 628.18
(6.9%) 2.7% ( -8% - 14%) 0.143
BrowseRandomLabelSSDVFacets 4.02 (7.4%) 4.17
(7.4%) 3.6% ( -10% - 19%) 0.129
TermDTSort 173.73 (6.3%) 180.06
(7.2%) 3.6% ( -9% - 18%) 0.087
BrowseDayOfYearSSDVFacets 5.83 (14.1%) 6.07
(15.6%) 4.1% ( -22% - 39%) 0.382
IntNRQ 595.22 (10.5%) 621.42
(7.2%) 4.4% ( -12% - 24%) 0.122
Fuzzy2 50.46 (6.7%) 52.94
(9.2%) 4.9% ( -10% - 22%) 0.054
This makes sense as the only place where we can expect a bit of overhead is
the additional `TotalHitCountCollectorManager` overhead associated with the
customized `TotalHitCountCollector` that the manager returns to support
intra-segment concurrency.
The second run is main (baseline) against my current branch
(my_modified_version) with the overhead in `TotalHitCountCollectorManager`
removed:
```
diff --git
a/lucene/core/src/java/org/apache/lucene/search/TotalHitCountCollectorManager.java
b/lucene/core/src/java/org/apache/lucene/search/TotalHitCountCollectorManager.java
index 50956725cb1..d95cef8c05d 100644
---
a/lucene/core/src/java/org/apache/lucene/search/TotalHitCountCollectorManager.java
+++
b/lucene/core/src/java/org/apache/lucene/search/TotalHitCountCollectorManager.java
@@ -51,7 +51,8 @@ public class TotalHitCountCollectorManager
@Override
public TotalHitCountCollector newCollector() throws IOException {
- return new LeafPartitionAwareTotalHitCountCollector(earlyTerminatedMap);
+ return new TotalHitCountCollector();
+ //return new
LeafPartitionAwareTotalHitCountCollector(earlyTerminatedMap);
}
```
TaskQPS baseline StdDevQPS
my_modified_version StdDev Pct diff p-value
AndHighLow 1215.06 (5.0%) 1168.26
(4.3%) -3.9% ( -12% - 5%) 0.009
OrNotHighLow 934.09 (3.8%) 914.26
(3.9%) -2.1% ( -9% - 5%) 0.078
BrowseMonthTaxoFacets 4.09 (5.0%) 4.04
(6.8%) -1.2% ( -12% - 11%) 0.511
CountTerm 4521.12 (8.9%) 4467.11
(7.2%) -1.2% ( -15% - 16%) 0.642
TermDTSort 83.56 (9.3%) 82.71
(10.7%) -1.0% ( -19% - 20%) 0.750
BrowseMonthSSDVFacets 5.89 (12.4%) 5.86
(13.4%) -0.5% ( -23% - 28%) 0.907
HighTerm 560.23 (7.3%) 558.11
(5.8%) -0.4% ( -12% - 13%) 0.856
PKLookup 160.43 (6.9%) 159.88
(6.0%) -0.3% ( -12% - 13%) 0.868
HighTermMonthSort 1183.43 (4.5%) 1180.78
(3.6%) -0.2% ( -7% - 8%) 0.862
AndHighMed 480.37 (4.8%) 479.74
(2.8%) -0.1% ( -7% - 7%) 0.916
HighPhrase 93.71 (4.5%) 93.75
(4.3%) 0.0% ( -8% - 9%) 0.972
MedIntervalsOrdered 46.65 (5.2%) 46.69
(5.1%) 0.1% ( -9% - 10%) 0.968
HighTermDayOfYearSort 309.90 (5.0%) 310.31
(4.3%) 0.1% ( -8% - 9%) 0.928
BrowseDayOfYearSSDVFacets 5.37 (10.4%) 5.38
(10.8%) 0.2% ( -19% - 23%) 0.957
BrowseDateSSDVFacets 1.01 (8.7%) 1.01
(9.3%) 0.3% ( -16% - 20%) 0.919
Wildcard 153.80 (5.2%) 154.33
(5.0%) 0.3% ( -9% - 11%) 0.833
OrHighMedDayTaxoFacets 4.12 (6.8%) 4.14
(6.7%) 0.4% ( -12% - 14%) 0.865
OrHighMed 299.87 (3.8%) 301.12
(3.3%) 0.4% ( -6% - 7%) 0.711
OrNotHighHigh 392.91 (5.3%) 394.61
(5.2%) 0.4% ( -9% - 11%) 0.793
LowSloppyPhrase 109.01 (4.1%) 109.53
(4.6%) 0.5% ( -7% - 9%) 0.731
CountAndHighMed 94.97 (4.0%) 95.42
(6.4%) 0.5% ( -9% - 11%) 0.777
LowPhrase 437.29 (3.4%) 439.41
(5.3%) 0.5% ( -8% - 9%) 0.733
Fuzzy1 69.22 (4.5%) 69.59
(6.1%) 0.5% ( -9% - 11%) 0.755
LowTerm 691.97 (4.4%) 695.79
(3.2%) 0.6% ( -6% - 8%) 0.649
MedSpanNear 9.42 (3.3%) 9.48
(2.8%) 0.6% ( -5% - 7%) 0.514
MedPhrase 91.74 (4.8%) 92.34
(5.4%) 0.7% ( -9% - 11%) 0.687
LowSpanNear 15.79 (4.6%) 15.91
(4.8%) 0.8% ( -8% - 10%) 0.612
Respell 38.77 (8.4%) 39.08
(7.3%) 0.8% ( -13% - 17%) 0.754
CountAndHighHigh 60.15 (4.8%) 60.64
(4.6%) 0.8% ( -8% - 10%) 0.582
AndHighHighDayTaxoFacets 7.59 (4.2%) 7.65
(5.3%) 0.8% ( -8% - 10%) 0.574
HighTermTitleSort 95.06 (4.0%) 95.88
(3.2%) 0.9% ( -6% - 8%) 0.448
CountPhrase 12.09 (3.3%) 12.21
(2.5%) 1.0% ( -4% - 7%) 0.277
Fuzzy2 46.03 (5.4%) 46.50
(5.8%) 1.0% ( -9% - 12%) 0.567
IntNRQ 42.07 (3.8%) 42.54
(3.6%) 1.1% ( -5% - 8%) 0.333
HighSpanNear 25.89 (4.0%) 26.23
(3.8%) 1.3% ( -6% - 9%) 0.289
OrHighLow 665.60 (3.8%) 674.34
(2.8%) 1.3% ( -5% - 8%) 0.218
BrowseRandomLabelTaxoFacets 3.14 (3.4%) 3.18
(5.4%) 1.5% ( -6% - 10%) 0.283
BrowseRandomLabelSSDVFacets 4.00 (8.3%) 4.06
(9.8%) 1.5% ( -15% - 21%) 0.591
MedSloppyPhrase 75.80 (4.8%) 76.96
(3.8%) 1.5% ( -6% - 10%) 0.262
BrowseDayOfYearTaxoFacets 3.85 (9.0%) 3.91
(8.2%) 1.6% ( -14% - 20%) 0.564
HighIntervalsOrdered 7.43 (6.3%) 7.55
(4.3%) 1.6% ( -8% - 12%) 0.338
OrNotHighMed 451.36 (6.9%) 458.85
(7.2%) 1.7% ( -11% - 16%) 0.456
HighSloppyPhrase 24.07 (7.6%) 24.52
(5.4%) 1.9% ( -10% - 16%) 0.362
BrowseDateTaxoFacets 3.88 (8.3%) 3.96
(8.4%) 2.0% ( -13% - 20%) 0.443
AndHighMedDayTaxoFacets 32.87 (6.1%) 33.56
(6.6%) 2.1% ( -9% - 15%) 0.293
AndHighHigh 80.31 (7.0%) 82.00
(6.6%) 2.1% ( -10% - 16%) 0.329
HighTermTitleBDVSort 32.34 (3.9%) 33.08
(2.6%) 2.3% ( -4% - 9%) 0.028
Prefix3 131.67 (4.4%) 134.74
(3.9%) 2.3% ( -5% - 11%) 0.075
OrHighNotMed 370.91 (7.0%) 380.92
(5.7%) 2.7% ( -9% - 16%) 0.180
OrHighNotLow 445.51 (7.9%) 458.42
(5.9%) 2.9% ( -10% - 18%) 0.189
OrHighNotHigh 396.82 (4.8%) 410.46
(5.5%) 3.4% ( -6% - 14%) 0.035
MedTerm 528.83 (6.4%) 548.26
(6.2%) 3.7% ( -8% - 17%) 0.066
OrHighHigh 103.91 (6.2%) 108.10
(6.6%) 4.0% ( -8% - 17%) 0.046
MedTermDayTaxoFacets 11.93 (4.8%) 12.49
(6.5%) 4.7% ( -6% - 16%) 0.010
LowIntervalsOrdered 86.39 (8.9%) 90.77
(7.5%) 5.1% ( -10% - 23%) 0.052
CountOrHighHigh 53.24 (25.6%) 60.63
(28.9%) 13.9% ( -32% - 91%) 0.108
CountOrHighMed 46.21 (25.8%) 53.82
(31.0%) 16.5% ( -32% - 98%) 0.068
Conclusion is that the small overhead on count is caused by the
`TotalHitCountCollectorManager` changes. We have an option to opt-in on the new
version of the manager, especially as the additional overhead is only needed
for intra-segment concurrency. That does complicate a bit the API hence it's
not entirely which direction we should go. In short: add an option to the
manager to signal that you rely on intra-segment slicing when needed. It would
be great to make this automatic (can be done in IndexSearcher#count) but there
is not direct link between a collector manager and the searcher where it is
used, so whether segments partitions are being searched is not known in the
manager.
The third and last run is main (baseline) against my current branch
(my_modified_version) but enabling intra-segment concurrency as follows:
```
diff --git
a/lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java
b/lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java
index 1c0bff93aa6..5f05177faca 100644
--- a/lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java
+++ b/lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java
@@ -331,7 +331,7 @@ public class IndexSearcher {
* MAX_DOCS_PER_SLICE will get their own thread
*/
protected LeafSlice[] slices(List<LeafReaderContext> leaves) {
- return slices(leaves, MAX_DOCS_PER_SLICE, MAX_SEGMENTS_PER_SLICE);
+ return slicesWithPartitions(leaves, MAX_DOCS_PER_SLICE,
MAX_SEGMENTS_PER_SLICE);
}
```
TaskQPS baseline StdDevQPS
my_modified_version StdDev Pct diff p-value
IntNRQ 53.67 (30.0%) 22.99
(13.1%) -57.2% ( -77% - -20%) 0.000
HighTermMonthSort 1152.98 (4.0%) 521.96
(2.8%) -54.7% ( -59% - -49%) 0.000
Wildcard 191.62 (4.0%) 89.97
(2.8%) -53.0% ( -57% - -48%) 0.000
Prefix3 583.57 (4.1%) 296.86
(3.4%) -49.1% ( -54% - -43%) 0.000
HighTermDayOfYearSort 376.24 (6.5%) 198.80
(2.6%) -47.2% ( -52% - -40%) 0.000
HighTermTitleSort 106.06 (2.3%) 63.12
(2.4%) -40.5% ( -44% - -36%) 0.000
HighTerm 600.13 (4.0%) 428.53
(3.3%) -28.6% ( -34% - -22%) 0.000
OrHighNotLow 504.45 (4.8%) 369.99
(3.7%) -26.7% ( -33% - -19%) 0.000
CountTerm 4185.03 (8.0%) 3094.54
(5.7%) -26.1% ( -36% - -13%) 0.000
LowTerm 738.23 (3.9%) 564.97
(2.9%) -23.5% ( -29% - -17%) 0.000
OrNotHighLow 873.49 (4.0%) 686.63
(2.8%) -21.4% ( -27% - -15%) 0.000
MedTerm 591.39 (6.0%) 476.60
(4.6%) -19.4% ( -28% - -9%) 0.000
BrowseDateSSDVFacets 1.01 (9.3%) 0.86
(6.5%) -15.0% ( -28% - 0%) 0.000
AndHighLow 1216.35 (3.7%) 1036.91
(4.4%) -14.8% ( -21% - -6%) 0.000
BrowseRandomLabelSSDVFacets 3.99 (9.0%) 3.52
(9.2%) -11.7% ( -27% - 7%) 0.000
OrNotHighMed 392.27 (5.2%) 347.95
(2.7%) -11.3% ( -18% - -3%) 0.000
BrowseDayOfYearSSDVFacets 5.36 (16.0%) 4.76
(8.5%) -11.2% ( -30% - 15%) 0.006
OrHighLow 552.26 (7.5%) 490.96
(3.1%) -11.1% ( -20% - 0%) 0.000
BrowseMonthTaxoFacets 4.01 (6.8%) 3.59
(4.7%) -10.6% ( -20% - 1%) 0.000
OrHighNotMed 314.53 (6.1%) 285.65
(4.7%) -9.2% ( -18% - 1%) 0.000
OrHighMedDayTaxoFacets 4.91 (5.5%) 4.49
(6.9%) -8.6% ( -19% - 3%) 0.000
BrowseMonthSSDVFacets 5.68 (15.8%) 5.19
(11.7%) -8.6% ( -31% - 22%) 0.051
Fuzzy1 83.62 (5.1%) 76.44
(6.5%) -8.6% ( -19% - 3%) 0.000
BrowseDateTaxoFacets 3.75 (6.6%) 3.50
(12.8%) -6.8% ( -24% - 13%) 0.034
PKLookup 163.08 (4.8%) 153.32
(4.5%) -6.0% ( -14% - 3%) 0.000
BrowseDayOfYearTaxoFacets 3.72 (6.0%) 3.51
(13.6%) -5.5% ( -23% - 14%) 0.095
BrowseRandomLabelTaxoFacets 3.17 (3.3%) 3.02
(13.7%) -4.9% ( -21% - 12%) 0.118
AndHighMedDayTaxoFacets 58.87 (6.9%) 56.23
(7.0%) -4.5% ( -17% - 10%) 0.041
Respell 32.63 (6.5%) 31.20
(5.0%) -4.4% ( -14% - 7%) 0.017
AndHighHighDayTaxoFacets 10.71 (3.2%) 10.26
(4.2%) -4.2% ( -11% - 3%) 0.000
TermDTSort 139.91 (6.5%) 134.73
(4.1%) -3.7% ( -13% - 7%) 0.031
MedTermDayTaxoFacets 20.89 (5.6%) 20.69
(5.0%) -1.0% ( -10% - 10%) 0.566
Fuzzy2 49.43 (5.4%) 50.64
(5.8%) 2.4% ( -8% - 14%) 0.167
OrNotHighHigh 256.44 (5.6%) 262.89
(4.5%) 2.5% ( -7% - 13%) 0.118
OrHighNotHigh 299.79 (5.5%) 332.13
(6.2%) 10.8% ( 0% - 23%) 0.000
OrHighMed 283.53 (4.2%) 354.04
(5.1%) 24.9% ( 14% - 35%) 0.000
HighPhrase 150.49 (3.7%) 198.04
(8.7%) 31.6% ( 18% - 45%) 0.000
MedSloppyPhrase 135.03 (4.9%) 182.50
(6.2%) 35.2% ( 23% - 48%) 0.000
CountOrHighMed 313.83 (3.8%) 435.20
(10.5%) 38.7% ( 23% - 55%) 0.000
AndHighMed 283.90 (2.8%) 422.91
(4.9%) 49.0% ( 40% - 58%) 0.000
OrHighHigh 114.64 (5.4%) 178.83
(10.1%) 56.0% ( 38% - 75%) 0.000
CountOrHighHigh 74.36 (24.4%) 125.75
(40.5%) 69.1% ( 3% - 177%) 0.000
CountAndHighMed 269.50 (5.1%) 472.96
(7.9%) 75.5% ( 59% - 93%) 0.000
LowPhrase 34.91 (4.2%) 63.27
(8.0%) 81.2% ( 66% - 97%) 0.000
AndHighHigh 34.49 (7.4%) 63.06
(9.6%) 82.9% ( 61% - 107%) 0.000
HighTermTitleBDVSort 43.49 (5.3%) 79.60
(6.9%) 83.1% ( 67% - 100%) 0.000
MedPhrase 88.33 (4.0%) 167.26
(6.9%) 89.4% ( 75% - 104%) 0.000
MedSpanNear 24.23 (2.9%) 46.89
(5.7%) 93.5% ( 82% - 105%) 0.000
CountAndHighHigh 59.20 (4.2%) 117.07
(12.4%) 97.8% ( 77% - 119%) 0.000
CountPhrase 30.21 (4.2%) 60.12
(9.8%) 99.0% ( 81% - 118%) 0.000
HighSloppyPhrase 33.61 (5.4%) 67.40
(10.6%) 100.5% ( 80% - 123%) 0.000
HighSpanNear 15.22 (3.1%) 30.96
(9.3%) 103.4% ( 88% - 119%) 0.000
HighIntervalsOrdered 31.78 (10.9%) 66.81
(15.1%) 110.2% ( 75% - 152%) 0.000
LowIntervalsOrdered 97.00 (7.8%) 209.73
(10.8%) 116.2% ( 90% - 146%) 0.000
LowSpanNear 13.38 (3.1%) 29.03
(8.5%) 117.0% ( 102% - 132%) 0.000
LowSloppyPhrase 44.38 (4.8%) 102.93
(11.7%) 131.9% ( 110% - 155%) 0.000
MedIntervalsOrdered 5.80 (6.0%) 14.09
(12.5%) 142.7% ( 117% - 171%) 0.000
I think that the regressions make sense in that they come from queries that
require computation ahead of time at the segment level, which gets duplicated
across segment partitions. In that case parallelizing makes things worse and
will need additional work to address that. For other queries, there is quite a
bit of value already. I'd say this is quite promising, given that the current
slicing approach is pretty basic and I have not put any effort into optimizing
it to get better benchmark results, and this index is not force merged. The max
number of documents per slice is set at 250_000.
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