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docs: re-run the fork-vs-upstream benchmark and add a results chart - #478
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Re-measured upstream 6560052 against fork ce6120b on Node 24.21.0 and Bun 1.4.3 on a quiet host. The fork is better in 68 of 76 comparisons, about the same in 5 and worse in 3 (Alamofire index on Node, warm explore on gin). README results tables, the cost list and the Node-or-Bun paragraph now quote that run, with a new chart. A dated benchmark doc holds the method, every table and a heatmap. render-charts.mjs builds the chart, heatmap and tables from the raw output.
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📝 Walkthrough
Priority: ⬇️ Low Merge Risk: ⚪ Minimal · up to The benchmark updates have no established outstanding issue in the reviewed changes; the older timing reference is clearly historical. Merge risk is minimal. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 4 systems. Changed systems: Architecture concerns Review details
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| Check name | Status | Explanation | Resolution |
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| User-Visible Changes Documented |  |
The diff adds the executable scripts/benchmarks/runtime/render-charts.mjs and its CLI flags: --date, --upstream, --fork, --node, --bun, --cards, --heatmap, and --tables. The script d… |
Document render-charts.mjs and all of its required and optional flags in README.md and in the matching page under site/src/content/docs/ (for example, the CLI reference). Alternatively, do not add the CLI interface. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly describes the main changes: rerunning the fork-versus-upstream benchmark and adding a results chart. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Suppressions Explained PASS. The pull request changes documentation, SVG assets, and a benchmark chart script. The added lines contain no lint, type-check, compiler-suppression directives or ignore-config entries, such as `…
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Explanation
The diff adds the executable
scripts/benchmarks/runtime/render-charts.mjsand its CLI flags:--date,--upstream,--fork,--node,--bun,--cards,--heatmap, and--tables. The script defines these in its usage handling, andscripts/benchmarks/runtime/README.mddocuments them. The pull request changes no file undersite/src/content/docs/, and neither the root README nor a site page documents this new CLI interface.
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Actionable comments posted: 3
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Inline comments:
Review comments at @README.md:
- Line 258: Update the “Larger database” sentence to say “the other six corpora
above” for the 12–22% range, keeping the separate 38% figure for Supabase.
Review comments at @scripts/benchmarks/runtime/render-charts.mjs:
- Around line 30-31: Update the attempt sorting in the directory selection flow
before find() so accepted attempts are ordered by the numeric aN suffix rather
than lexicographically. Keep the existing accepted-status check and select the
first accepted attempt in numeric order.
- Line 97: Update ratio() to handle a zero baseline before division: treat two
zero measurements as equal, and give a positive fork measurement against a zero
baseline an explicit non-NaN display value. Ensure both cases remain visible in
the comparison counts and heatmap.
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CHANGELOG.mdREADME.mddocs/benchmarks/fork-vs-upstream-node-bun-2026-10-12.mdscripts/benchmarks/runtime/README.mdscripts/benchmarks/runtime/render-charts.mjs
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State that the host-quiet rule differs from the 2026-10-03 run, describe the two-line sync edit, say what --tables writes, sort attempts by number, handle a zero baseline, and fail on a missing watcher-sync value instead of dropping it. Reword the database-size bullet so supabase is not counted in both groups.
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The fork is better than upstream in 68 of 76 benchmark comparisons, about the same in 5 and worse in 3, measured 2026-10-12 on a quiet host. This updates the README's results and adds a chart and a dated benchmark doc.
What changed
6560052aagainst forkce6120beon Node 24.21.0 and Bun 1.4.3, a results chart, and the "Node or Bun" paragraph and "What it costs" list re-derived from the new numbers. The stale "table predates three fixes" paragraph is gone, since the tables now include them.docs/benchmarks/fork-vs-upstream-node-bun-2026-10-12.md: method, all four arms, graph sizes, MCP and CLI tables, a heatmap of every result, a comparison with 2026-10-03, and how runs were accepted or rejected.scripts/benchmarks/runtime/render-charts.mjs: builds the chart, heatmap and every table from the raw run output, so no figure is typed by hand. A second run produces identical files.Results (Node, two runs per arm, medians)
The 3% reporting band is a convention, not a statistical margin. Results near it are labelled no clear change.
README rows checked
"About this fork" and "Measured results": the intro paragraph, the full index, one-file sync, MCP and CLI tables, the two prose paragraphs and the cost list were updated. The "Measured separately" table (worktree seeding, call-link precision) and the upstream-benchmark disclaimers were left, because they are not part of this run. The upstream merge point in "About this fork" is unchanged.
__tests__/readme-sync.test.tspasses (6 tests).Limits
Summary by cubic
Re-runs the fork-vs-upstream benchmark on Node 24.21.0 and Bun 1.4.3 and refreshes the README's results, replacing the tables that predated three fixes and dropping the note that said so. The fork is better in 68 of 76 comparisons, about the same in 5 and worse in 3.
What changed
render-charts.mjsbuilds the chart, heatmap and all tables from the raw run output, so no figure is typed by hand and a second run produces identical files.Written for commit 4186b69. Summary will update on new commits.
Summary by CodeRabbit