gitmodimo commented on PR #51094:
URL: https://github.com/apache/arrow/pull/51094#issuecomment-5494996449

   ## Benchmark results
   | Version | Execution | Stored results |
   |---|---|---|
   | Baseline `1fa6ddd` | [Buildkite 
#1100](https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-amd64-c6a-4xlarge-linux/builds/1100/list)
 | [Conbench 
baseline](https://conbench.arrow-dev.org/runs/2f450098d0294a609592ad36499780e8/)
 |
   | rework `0d06ddc` | [Buildkite 
#1101](https://buildkite.com/apache-arrow/arrow-bci-benchmark-on-amd64-c6a-4xlarge-linux/builds/1101/list)
 | [Conbench 
rework](https://conbench.arrow-dev.org/runs/81c32f555bab4914876d33eae578d5cc/) |
   
   Times below are median wall time in milliseconds. Speedup is `baseline / 
rework`.
   
   ### Density and direction
   
   | Keys | L/R spacing | Direction | Serial baseline → rework | Speedup | 
Threaded baseline → rework | Speedup |
   |---|---:|---|---:|---:|---:|---:|
   | int32 | 400/400 | backward | 150.34 → 7.65 | 19.65× | 155.08 → 6.78 | 
22.88× |
   | int32 | 400/400 | forward | 264.28 → 8.84 | 29.91× | 296.84 → 7.87 | 
37.72× |
   | int32 | 200/1000 | backward | 692.05 → 9.16 | 75.54× | 672.34 → 8.24 | 
81.55× |
   | int32 | 200/1000 | forward | 898.34 → 10.41 | 86.30× | 923.89 → 9.37 | 
98.64× |
   | int32 | 1000/200 | backward | 25.60 → 9.05 | 2.83× | 24.15 → 8.24 | 2.93× |
   | int32 | 1000/200 | forward | 72.53 → 10.76 | 6.74× | 79.70 → 9.86 | 8.08× |
   | string128 | 400/400 | backward | 132.56 → 10.18 | 13.02× | 173.26 → 7.80 | 
22.21× |
   | string128 | 400/400 | forward | 291.34 → 11.71 | 24.89× | 344.73 → 9.19 | 
37.51× |
   | string128 | 200/1000 | backward | 681.20 → 12.32 | 55.28× | 678.57 → 9.45 
| 71.82× |
   | string128 | 200/1000 | forward | 996.47 → 13.71 | 72.69× | 1003.86 → 10.78 
| 93.08× |
   | string128 | 1000/200 | backward | 29.17 → 12.09 | 2.41× | 26.33 → 9.42 | 
2.79× |
   | string128 | 1000/200 | forward | 99.32 → 14.32 | 6.94× | 102.87 → 11.20 | 
9.19× |
   
   ### Scaling and overhead
   
   | Case | Serial baseline → rework | Speedup | Threaded baseline → rework | 
Speedup |
   |---|---:|---:|---:|---:|
   | Frequency 200 | 724.37 → 16.94 | 42.77× | 711.96 → 15.57 | 45.73× |
   | Default, merged | 170.56 → 8.53 | 20.00× | 150.59 → 7.74 | 19.46× |
   | Frequency 1000 | 19.12 → 3.50 | 5.45× | 19.64 → 3.37 | 5.83× |
   | 10 columns | 181.07 → 8.18 | 22.13× | 144.09 → 7.39 | 19.51× |
   | 100 columns | 239.44 → 10.88 | 22.01× | 237.14 → 10.91 | 21.74× |
   | 100 IDs | 8.50 → 1.61 | 5.27× | 8.64 → 1.77 | 4.88× |
   | 1000 IDs | 713.62 → 17.33 | 41.17× | 682.07 → 15.29 | 44.60× |
   | 10 right tables | 320.14 → 79.90 | 4.01× | 335.45 → 24.38 | 13.76× |
   | 50 right tables | 1054.67 → 427.78 | 2.47× | 1094.06 → 104.36 | 10.48× |
   | Batch size 1000 | 331.80 → 9.64 | 34.42× | 329.84 → 8.97 | 36.78× |
   | Batch size 32000 | 89.89 → 7.95 | 11.30× | 68.87 → 8.14 | 8.46× |
   
   All 46 matched records improved:
   
   - Serial: median 20.00×; range 2.41×–86.30×.
   - Threaded: median 21.74×; range 2.79×–98.64×.
   


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