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docs(fictrac-columns): numbers from the committed sizing script + the derived-channel correction (LAB-303) - #265
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… derived-channel correction (LAB-303) Follow-up to #263: the reproducible ros2-poc/sizing/columns.py (PR #264) measures the adopted record at 2.41x / 2.68x the jsonl.gz (the first version quoted 2.24x / 2.48x from a scratch script); the live turning_dps / forward_mms cost 16 B/frame of incompressible doubles, not "about 1 %" (that came from a bench bag whose derived fields were the 2026-10-14 mixed-build garbage), so the implementation records them as NaN. Links the implementation PR. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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Summary
Follow-up to #263 (merged) for
docs/development/fictrac-columns-in-the-bag.md, from the implementation PR #264:ros2-poc/sizing/columns.pymeasures the adopted record at 2.41× / 2.68× the jsonl.gz on the two bench bags (the first version quoted 2.24× / 2.48× from a scratch script whose packing differed slightly); the table and the headline now carry the committed script's numbers (all 25 columns 4.4× / 5.3×; batched 2.10× / 2.34×; fixed-point 1.96× / 2.09× per record).turning_dps/forward_mmscost 16 B per frame of incompressible doubles (a fifth of the record), not "≈ 1 %" — that figure came from bench bag 1, whose derived fields were the constant garbage of the 2026-10-14 mixed-build bug. They are exactly recomputable, so ros2-poc: the FicTrac record in the bag — one /arena/frame message per frame with 10 columns (LAB-303) #264 records them as NaN (same message type; the live topic keeps them). The doc says so in §2, §3 and §4.Tier
docs/skills-only.
Release notes
none
Test plan
pixi run size-columns -- <bag> <jsonl> --allon both bench bags (ros2-poc: the FicTrac record in the bag — one /arena/frame message per frame with 10 columns (LAB-303) #264)LAB-303. Linear not touched.
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