neoremind commented on pull request #91:
URL: https://github.com/apache/lucene/pull/91#issuecomment-824172567
> For instance I'd expect users who index integers (4 bytes) between 0 and
2^24 to notice speedups that are closer to the one that you computed for
bytesPerDim=3 than for bytesPerDim=4.
@jpountz I add a new benchmark test case `testBenchmarkWithLeadingZeroBytes`
in `TestBKDDisableSortDocId`. Your assumption is correct.
Result is shown as below (do not make stable reorder as default).
```
bytesPerDim=4, leadingZeroByteNum=[1,2,3]
-------------------------------------------------
| bytesPerDim | isDocIdIncremental | avg time(us) |
-------------------------------------------------
| 4 | N | 1476874.0 | <- leadingZeroByteNum =
1
| 4 | Y | 1363280.3 | <- leadingZeroByteNum = 1
| 4 | N | 1601885.9 | <- leadingZeroByteNum = 2
| 4 | Y | 930728.1 | <- <- leadingZeroByteNum
= 2
| 4 | N | 1210586.8 | <- leadingZeroByteNum = 3
| 4 | Y | 367141.6 | <- <- leadingZeroByteNum
= 3
-------------------------------------------------
```
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