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Native cursor window#1050
kennethshackleton wants to merge 1 commit into
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kennethshackleton:native-cursor

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@kennethshackleton kennethshackleton commented Aug 25, 2026 •
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Mac JMH

Summary

Heap Allocation

rowCount NATIVE alloc.norm (JDK17 / JDK25) SIMPLE alloc.norm (JDK17 / JDK25)
1 168 B / 408 B 144 B / 120 B
50 168 B / 408 B 3,360 B / 3,400 B
1000 168 B / 408 B 84,008 B / 84,008 B
50000 168 B / 416 B 4,451,081 B / 4,451,087 B

Throughput

rowCount NATIVE (JDK17 / JDK25) SIMPLE (JDK17 / JDK25) NATIVE speedup
1000 21.1 / 20.9 µs 29.8 / 28.3 µs ~29% / ~26%
50000 902.1 / 878.4 µs 1320.6 / 1236.9 µs ~32% / ~29%

Java 25

% ./gradlew :selekt-java:jmhJava25 -Pjmh.includes=CursorWindowBenchmark -Pjmh.profilers=gc -q

Benchmark                                                   (cursorFactory)  (rowCount)  Mode  Cnt        Score    Error   Units
CursorWindowBenchmark.fillCursorWindow                               NATIVE           1  avgt   10        2.839 ±  0.072   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE           1  avgt   10      137.061 ±  3.402  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE           1  avgt   10      408.001 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE           1  avgt   10        4.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      NATIVE           1  avgt   10        5.000               ms
CursorWindowBenchmark.fillCursorWindow                               NATIVE          50  avgt   10        4.074 ±  0.073   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE          50  avgt   10       95.513 ±  1.690  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE          50  avgt   10      408.002 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE          50  avgt   10        2.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      NATIVE          50  avgt   10        3.000               ms
CursorWindowBenchmark.fillCursorWindow                               NATIVE        1000  avgt   10       20.856 ±  0.199   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE        1000  avgt   10       18.654 ±  0.175  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE        1000  avgt   10      408.009 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE        1000  avgt   10          ≈ 0           counts
CursorWindowBenchmark.fillCursorWindow                               NATIVE       50000  avgt   10      878.418 ±  9.268   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE       50000  avgt   10        0.452 ±  0.037  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE       50000  avgt   10      416.142 ± 37.160    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE       50000  avgt   10          ≈ 0           counts
CursorWindowBenchmark.fillCursorWindow                               SIMPLE           1  avgt   10        2.706 ±  0.056   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE           1  avgt   10       42.291 ±  0.844  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE           1  avgt   10      120.001 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE           1  avgt   10        1.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE           1  avgt   10        1.000               ms
CursorWindowBenchmark.fillCursorWindow                               SIMPLE          50  avgt   10        4.335 ±  0.052   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE          50  avgt   10      747.965 ±  8.977  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE          50  avgt   10     3400.002 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE          50  avgt   10       17.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE          50  avgt   10       13.000               ms
CursorWindowBenchmark.fillCursorWindow                               SIMPLE        1000  avgt   10       28.260 ±  0.165   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE        1000  avgt   10     2834.599 ± 16.416  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE        1000  avgt   10    84008.012 ±  0.002    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE        1000  avgt   10       64.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE        1000  avgt   10       34.000               ms
CursorWindowBenchmark.fillCursorWindow                               SIMPLE       50000  avgt   10     1236.901 ± 11.893   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE       50000  avgt   10     3431.494 ± 32.574  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE       50000  avgt   10  4451087.270 ± 21.969    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE       50000  avgt   10       77.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE       50000  avgt   10       46.000               ms

Java 17

% ./gradlew :selekt-java:jmhJava17 -Pjmh.includes=CursorWindowBenchmark -Pjmh.profilers=gc -q

Benchmark                                                   (cursorFactory)  (rowCount)  Mode  Cnt        Score    Error   Units
CursorWindowBenchmark.fillCursorWindow                               NATIVE           1  avgt   10        3.412 ±  0.274   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE           1  avgt   10       47.067 ±  3.717  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE           1  avgt   10      168.002 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE           1  avgt   10        1.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      NATIVE           1  avgt   10          ≈ 0               ms
CursorWindowBenchmark.fillCursorWindow                               NATIVE          50  avgt   10        4.410 ±  0.222   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE          50  avgt   10       36.360 ±  1.762  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE          50  avgt   10      168.002 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE          50  avgt   10        1.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      NATIVE          50  avgt   10          ≈ 0               ms
CursorWindowBenchmark.fillCursorWindow                               NATIVE        1000  avgt   10       21.115 ±  0.437   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE        1000  avgt   10        7.588 ±  0.153  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE        1000  avgt   10      168.010 ±  0.003    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE        1000  avgt   10        2.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      NATIVE        1000  avgt   10        2.000               ms
CursorWindowBenchmark.fillCursorWindow                               NATIVE       50000  avgt   10      902.060 ± 12.943   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                NATIVE       50000  avgt   10        0.178 ±  0.003  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           NATIVE       50000  avgt   10      168.435 ±  0.135    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     NATIVE       50000  avgt   10          ≈ 0           counts
CursorWindowBenchmark.fillCursorWindow                               SIMPLE           1  avgt   10        2.842 ±  0.036   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE           1  avgt   10       48.316 ±  0.603  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE           1  avgt   10      144.001 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE           1  avgt   10        1.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE           1  avgt   10          ≈ 0               ms
CursorWindowBenchmark.fillCursorWindow                               SIMPLE          50  avgt   10        4.183 ±  0.062   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE          50  avgt   10      766.006 ± 11.229  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE          50  avgt   10     3360.002 ±  0.001    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE          50  avgt   10       17.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE          50  avgt   10        9.000               ms
CursorWindowBenchmark.fillCursorWindow                               SIMPLE        1000  avgt   10       29.808 ±  0.270   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE        1000  avgt   10     2687.434 ± 24.020  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE        1000  avgt   10    84008.014 ±  0.004    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE        1000  avgt   10       60.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE        1000  avgt   10       29.000               ms
CursorWindowBenchmark.fillCursorWindow                               SIMPLE       50000  avgt   10     1320.562 ± 12.107   us/op
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate                SIMPLE       50000  avgt   10     3214.136 ± 29.010  MB/sec
CursorWindowBenchmark.fillCursorWindow:·gc.alloc.rate.norm           SIMPLE       50000  avgt   10  4451080.636 ±  0.196    B/op
CursorWindowBenchmark.fillCursorWindow:·gc.count                     SIMPLE       50000  avgt   10       72.000           counts
CursorWindowBenchmark.fillCursorWindow:·gc.time                      SIMPLE       50000  avgt   10       39.000               ms

@kennethshackleton
kennethshackleton force-pushed the native-cursor branch 30 times, most recently from 41ba1b0 to 51a8984 Compare August 28, 2026 13:30
@kennethshackleton
Native cursor window
ed93e79 
Signed-off-by: Ken Shackleton <kshackleton1@bloomberg.net>
@sonarqubecloud

sonarqubecloud Bot commented Aug 28, 2026

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Quality Gate Passed Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

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