docs(perf): reject both actual-server PGO screens - #4071
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📝 WalkthroughWalkthroughThe PR records Darwin server PGO reproduction inputs, counter-only and full-value experiment results, compatibility diagnostics, audit evidence, offline equivalence checks, and rejection outcomes. No PGO compiler flags or shipping integration change. ChangesDarwin server PGO qualification
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to This change records rejection of the server-PGO candidates without changing shipped runtime behavior. Reproduction and validation guidance still needs the documented root validation commands, and the retained training-harness qualification concerns should remain tracked before treating these evidence artifacts as fully reliable. 🚥 Pre-merge checks | ✅ 7 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (7 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 11 functions across 4 files. (3 skipped: 3 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Reviewed final evidence tree at d8a30b9. Independently recomputed every published cohort readiness and startup-plus-readiness aggregate from the 27 retained rows, checked all 54 transport/cache/cleanup outcomes, and reproduced each sampled RSS maximum from its retained samples. The sole unqualified row is the 263 MB diagnostic comparison. The primary held-out result remains below threshold; the all-27 aggregate and qualified subset do not replace it. Generator-only patches, stock-source equivalence, compiler mismatch limits and the private-v3/public-v2 distinction are explicit. No shipping implementation or compiler flag change is included. |
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Inline comments:
In `@scripts/perf/evidence/server-pgo-darwin-2026-09-07/README.md`:
- Line 23: Update the training-plan validation in screen_http_v2.py to assert
exactly five training rows before deriving or validating training hashes, while
retaining the existing unique-hash check. Ensure plans with six rows, including
duplicated publicSha256 values, are rejected before protocol, qualification, or
final-result recording.
In
`@scripts/perf/evidence/server-pgo-full-value-http-4059/training-harness-shutdown.patch`:
- Line 18: Update the shutdown cleanup around conn and session.close so the
HTTPConnection is closed in a finally block before graceful process termination,
guarding the close when conn was never created; preserve the existing SIGINT
behavior after cleanup.
- Line 29: Update the result['success'] predicate in the training harness to
require result['normalTrainingExit'] alongside the existing loading and
cache-replay conditions. Preserve the current success criteria and ensure a
nonzero generator exit cannot produce success or exit code 0.
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📒 Files selected for processing (17)
scripts/perf/README.mdscripts/perf/evidence/native-pgo-current-2026-09-07/README.mdscripts/perf/evidence/server-pgo-counter-http-4059/README.mdscripts/perf/evidence/server-pgo-counter-http-4059/screen.jsonscripts/perf/evidence/server-pgo-darwin-2026-09-07/README.mdscripts/perf/evidence/server-pgo-darwin-2026-09-07/capacity-projection.example.jsonscripts/perf/evidence/server-pgo-darwin-2026-09-07/corpus.example.jsonscripts/perf/evidence/server-pgo-darwin-2026-09-07/plan.example.jsonscripts/perf/evidence/server-pgo-darwin-2026-09-07/pre-screen-provenance.jsonscripts/perf/evidence/server-pgo-full-value-http-4059/README.mdscripts/perf/evidence/server-pgo-full-value-http-4059/compiler-compatibility.jsonscripts/perf/evidence/server-pgo-full-value-http-4059/generator-only-shutdown.patchscripts/perf/evidence/server-pgo-full-value-http-4059/independent-audit.jsonscripts/perf/evidence/server-pgo-full-value-http-4059/offline-equivalence.jsonscripts/perf/evidence/server-pgo-full-value-http-4059/provenance.jsonscripts/perf/evidence/server-pgo-full-value-http-4059/screen.jsonscripts/perf/evidence/server-pgo-full-value-http-4059/training-harness-shutdown.patch
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Inline comments:
In `@scripts/perf/evidence/server-pgo-full-value-http-4059/README.md`:
- Line 43: Update the validation guidance in the README to list root-level pnpm
typecheck and pnpm test commands, and relabel python -m unittest discover -s .
-p "test_*.py" as an additional harness-only check. Keep the existing public
harness test instructions and do not change unrelated reproduction details.
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scripts/perf/evidence/server-pgo-darwin-2026-09-07/harness-source-map.jsonscripts/perf/evidence/server-pgo-darwin-2026-09-07/reproduce/screen_http_v2.pyscripts/perf/evidence/server-pgo-darwin-2026-09-07/reproduce/test_training_plan.pyscripts/perf/evidence/server-pgo-full-value-http-4059/README.mdscripts/perf/evidence/server-pgo-full-value-http-4059/corrected-training-harness-shutdown.patchscripts/perf/evidence/server-pgo-full-value-http-4059/test_training_shutdown.pyscripts/perf/evidence/server-pgo-full-value-http-4059/training_shutdown.py
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87 files and 2.3 MB of rejected-experiment blobs and unrun harnesses, none of which CI executes and none of which any scripts/perf entrypoint reads. The tree needed a CI bypass to exist: every one of the seven evidence-only PRs that built it (#4060, #4061, #4068, #4069, #4070, #4071, #4072 -- each touching nothing but the tree and the ledger) carried revert-oracle-exempt, which skips the lane entirely. #4069's body says why: "The oracle classified retained measurement JSON as production code and failed because it has no changed application test." Three of its READMEs specify zero-context patches so blank context lines do not trip the whitespace gate. The repo keeps what CI runs and what the next agent must read before spiking; the rest lives in git history at a named SHA. Each of the nine ledger sections that linked into the tree becomes one bullet in the section matching its verdict, in the house style the older #1445 entry already uses: verdict, the mechanism that failed, the headline number with its cohort size, the issue and PR, and a `git show` pointer pinned to 4fbbe8d. Five went to "Dead ends", four to "Shipped wins", and the #3978 harness smoke folded into the manual-readiness section as one sentence. #4031's verdict joins them: a dead end that was recorded only in an issue comment and absent from the ledger entirely. Two things stay inline rather than behind a pointer, because they are what a re-spike gets wrong: the PGO RUSTFLAGS decisions (empty control, -Cprofile- generate with its Darwin section alignment for counter-only training only, -Cprofile-use, and the build-std/target split that makes the probe's profile and the server's non-interchangeable), and the Y-up orientation rule (x, y, z) -> (x, z, -y). The archived patches are the only public copy of their mechanism. d979e92e4, 3e675edea, 67c3f6d31 and bdc38d30c are on no remote (`git branch -r --contains` is empty for all four), so each bullet cites its patch path plus a public apply base checked reachable on origin/main: 96ea5f0, e409924, 1b95c66. The two chained follow-up patches (later-tests.patch reproducing bdc38d30c, test-followup.patch reproducing c0ef3e802) get a pointer each for the same reason. All five patches were applied for real against their cited bases with `git apply --cached --unidiff-zero` into a temporary index; all five succeed and both follow-ups chain after their measured patch. 7509432 is NOT on origin/main -- it is the local pre-squash measured source -- so it is not cited as an apply base. Every one of the 15 `git show` pointers resolves. .github/workflows/test.yml's path-filter comment names the tree. The claim is historical and stays true, so it is only marked as removed so a future grep does not chase the path. No workflow logic changes. `git grep perf/evidence` now returns that comment and the pinned pointers, nothing else. Deleting the tree also removes the only Python project root outside rust/python and tools/ifcopenshell_reference, and with it the dependabot noise source behind #4073 and #4074. Closes #4112. Claude-Session: https://claude.ai/code/session_0193douQ6sTYHE65DJmyAei9 Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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Both fresh actual-server PGO candidates failed their predeclared qualification gates. Preserve the separate 27-model counter-only and full-value screens and stop without five-pair continuation or shipping flags. The full-value held-out22 readiness reduction is4.071% (qualified21:4.310%), below5%; one model retains a strict CSG diagnostic mismatch and the largest regresses in time and sampled RSS. The native processing-probe result remains qualified within its different scope.
This final stack entry contains every pair, startup/readiness estimators, full RSS samples, exact output/cache/cleanup gates, compiler/profile provenance and the generator-only graceful-shutdown recipe/patches. The original measured commit is preserved with a public source-equivalence proof. The private v3 offline wrapper is explicitly distinguished from published v2: retained small/large validation outputs are byte-identical, but no v3 source-publication claim is made.
Validation:54 full-value transports completed,26/27 strict semantic comparisons passed; the failing model differs only in three CSG count fields194→196, with raw geometry/data-model/cache equality retained. Independent cohort/arithmetic/diagnostic audit passed. Public JSON/privacy checks and both recipe patch application checks pass. Compiler warnings and all slower pairs remain visible. This commit adds1,212 lines relative to its stack parent, without production code changes.
Closes #4059: bounded qualification is complete; both actual-server variants are rejected. The earlier native probe evidence is not a shipping claim.
Summary by CodeRabbit
Documentation
Performance Evidence
Tests