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docs(perf): expose warm scan variability and evidence limits

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Signed-off-by: discord9 <55937128+discord9@users.noreply.github.com>
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discord9
2026-09-08 14:05:48 +08:00
parent 4f363b379f
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tests/perf/query_cases/sst_float_bss/RESULTS.md
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@@ -90,9 +90,14 @@ arbitrary base/candidate pair was selected. Across the three datasets this was
| formal-3 | allcolumns | parquetbench | 72.522 | 34.300 | -52.70% |
| formal-3 | allcolumns | scanbench | 137.906 | 89.151 | -35.35% |
Warm results varied substantially, especially formal-2 all-column scanbench.
They were run on a non-isolated local development host, with no CPU affinity and
no cache drop, so they are not a direct historical comparison.
Warm results varied substantially, especially formal-2 all-column scanbench:
its eight round medians ranged from 120.158–422.669 ms (base) and
85.224–243.650 ms (candidate); candidate was slower in rounds 7 and 8.
These deltas are ratios of separately aggregated medians, not medians of paired
percentage changes. Scanbench's projection is verified from commands/configs,
not a printed schema. Target order alternated, but projection order stayed fixed.
The runs used a non-isolated local development host, with no CPU affinity or
cache drop. No specific cause of the variability was established.
## Scope, comparison, and artifacts