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benbrownandClaude Opus 4.8
899d55f4b6
An adversarial audit found the enforcement story ahead of the code: gates that were documented as hard gates were advisory, manual, or absent, and several human-facing claims outran the machine record. This makes the claims true. High findings - Differential fuzz was documentation, not enforcement: verdict hardcoded fuzz_iters=0 and diff-test hardcoded the gate to Skipped, while the case studies claimed 10k-iteration fuzz on the same wins. Fuzz is now a real pipeline gate (strict FUZZ-RESULT contract, executed count recorded), and it is inherently baseline-vs-candidate, so it runs on the accept path and reports Skipped in the standalone `just gates` flow. New hard rule: a machine `accepted` verdict is impossible unless the fuzz gate actually passed — otherwise it caps at needs-human-review. - The agent's system prompt claimed FP/concurrency/unsafe patches were "routed to human review automatically". No such mechanism existed. Added a conservative lexical risk classifier (crates/verdict/src/risk.rs) that forces needs-human-review on any would-be accept carrying those signals; fp-tolerance equivalence always signals. - The local verdict path ran agent-influenced code unsandboxed. It now runs under scripts/no-net.sh (network namespace) and fails closed. Upstream test suites are hash-verified against corpora/<t>/TESTSUITE.sha256 when present (scripts/pin-testsuite.sh generates them). Also fixed, found while fixing the above - The pipeline script's `set -e` was inert (brace group as the left operand of `&&`), so a failing candidate build did not abort the run and verdict could bench a stale binary. Now a scoped subshell whose status is branched on at top level. - A wrapper that exits before exec'ing (no-net.sh refusing, bad wrapper path) stranded RUNNING.lock and left read_verdict polling forever. Failure accounting now lives outside the wrapper. - harnessd's patch allowlist ignored git rename/copy headers and --no-prefix diffs; the rename-escape case is now a committed regression test. - The workspace did not compile on Windows (ungated Unix APIs). cfg-gated; 71 portable tests now run on both platforms. - pin-check regenerated the corpus manifest instead of verifying it; it is now verify-only, with a deliberate `just pin-corpus` to re-pin. - Max RSS is captured per run on Unix; PMU counters are opt-in diagnostics (compare --perf-stat), never part of the accept decision. Docs now match the code, including what is NOT yet enforced: no target ships a TESTSUITE.sha256 pin, no target declares [build].tsan, and matmul is not wired to the fp-tolerance gate — each is stated as mechanized-but-inert rather than done. Corrected the stale "33 ledger rows" (34), the playbook's class-3 cJSON win (rejected), adversarial-review.md's sanitizer-separation claim (five accepted rows carry sanitizers_clean=false), the unsupported "40,000 requests" figure, and the blanket "historical rows record fuzz_iters=0" (8 of 10; phase0-tokei-002/-003 record 4,332). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
95 lines
4.6 KiB
Markdown
95 lines
4.6 KiB
Markdown
# peltier.io
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> Spot cooling for hot paths. A profile-guided optimization agent that
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> only ships wins it can prove.
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peltier.io profiles real binaries and services, isolates hot paths, proposes
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optimizations, and accepts a change **only** when two independent bars are
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cleared: **behavioral equivalence** (upstream tests + byte-identical golden
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replay + differential fuzzing + sanitizers) and **statistical significance**
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(the speedup's bootstrap 95% CI lower bound clears a threshold on
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calibrated hardware). A change without both is discarded and logged.
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Consultants sell surveys; compilers sell flags. Peltier sells **verified
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deltas with the methodology attached** — a stopwatch on pinned hardware, a
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proof of equivalence, and an ROI figure whose confidence interval survives
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hostile review.
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📖 **Full documentation: the [peltier.io book](https://bdbrown4.github.io/peltier.io/)**
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· Design spec: [SPEC.md](SPEC.md) · Charter: [CLAUDE.md](CLAUDE.md)
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## Verified results
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Every number carries its 95% CI and its workload, and every one survived the
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gates above. Across **five phases and 34 ledger rows, zero shipped false
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accepts** — including two pipeline over-accepts the audit caught before
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anything shipped, each becoming a permanent new gate.
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| Target | Win | Verified |
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|---|---|---|
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| tokei (Rust) — LTO (class 1) | +10.4% | CI [+8.5%, +12.0%] |
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| tokei — three class-5 algorithmic wins | +10.7% / +3.7% / +9.9% | each CI-significant |
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| cJSON (C) — number-handling rewrite (class 5) | +8.85% | CI [+7.5%, +10.0%] |
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| cJSON HTTP service — p50 latency under replay | +6.2% | CI [+5.8%, +7.2%] |
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| comrak (Rust) — mimalloc (class 2) | +4.6% | CI [+3.3%, +5.8%], [human-ruled](results/rulings/phase0-comrak-002.md) |
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## Layout
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```
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crates/ Trust layer — agent has NO write access (SPEC §10)
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bench-runner/ Interleaved A/B, bootstrap CIs, A/A calibration, service mode
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diff-test/ Equivalence gates, corpus hash-pinning, per-target spec
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ledger/ Append-only SQLite attempt ledger (mutation-refusing triggers)
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report/ ROI: speedup CI → cores → dollars, methodology inline
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verdict/ The pipeline in one command: gates → bench → ledger row
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harnessd/ The one door the agent talks through (7 JSON ops)
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agent/ Untrusted proposer (Claude Agent SDK, Python)
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playbook/ Optimization classes 1–7, tried strictly cheapest-first
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config/ accept.toml (thresholds), pricing.toml (ROI inputs)
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targets/ Vendored OSS targets — the only agent-writable path
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corpora/ Hash-pinned golden-replay inputs (read-only to agent)
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results/ Calibration evidence, case studies, generated ROI reports
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docs/ The mdBook site (deployed to GitHub Pages)
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```
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## Quick start
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```sh
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just build / test / lint # trust-layer workspace
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just aa # A/A self-test — must yield a null verdict
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just gates <target> # corpus pin + upstream tests + golden replay
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# (fuzz needs a baseline — it runs in `just verdict`)
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just verdict <t> <bin> ... # gates + fuzz + sanitizers + bench vs pristine baseline
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just report <run-id> # ROI report from a ledger row
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just isolation-check # 19 OS-boundary checks (both modes)
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```
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The pipeline is **Linux/POSIX-only** at runtime (Unix sockets, `setsid`,
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sh-based gates). Windows builds the workspace and runs the portable unit
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tests, but cannot run the pipeline.
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Full command reference and reproduction steps:
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[Reproduce it yourself](https://bdbrown4.github.io/peltier.io/reproduce.html).
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## How it stays honest
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- The agent speaks to the trust layer through **seven read-only-plus-one-
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write JSON operations**; it has no shell, cannot write outside a target
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workspace, and cannot touch the ledger or thresholds.
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- The **baseline is rebuilt from a pristine checkout** every session — a
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patch never becomes its own comparison.
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- The **ledger is append-only** (SQLite triggers refuse UPDATE/DELETE);
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accepted rows are written only by the `verdict` binary after the gates.
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- The agent process runs under **OS-level isolation** (read-only mount
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namespace or an unprivileged uid) — the boundary is filesystem
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permissions, not a prompt.
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See [the case studies](https://bdbrown4.github.io/peltier.io/case-studies/overview.html)
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— especially [the caught false-accept](https://bdbrown4.github.io/peltier.io/case-studies/comrak-false-accept.html),
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where the pipeline over-accepted a leaking patch and the audit overturned
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it before it shipped.
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## License
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GPL-3.0-or-later — see [LICENSE](LICENSE).
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