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The monorepo's IOReport energy backends now decline unless the CPU energy rail keeps advancing: on macOS 27 an unprivileged reader sees the CPU rails frozen or republished only in rare lumps, so a meter that trusted a present counter reported CPU work as GPU-only energy, or as zero, while tagging it a reading. The owner's decision is that a vendor energy counter is a real reading (the trust gap is provenance, not accuracy), so a LIVE reading is graded as a hardware reading, and every spec that grades vendor counters now carries the same rule: A reading from a vendor energy counter (RAPL, NVML, Apple IOReport, ...) MAY be graded as a hardware reading only while the counter is demonstrably live for the domain the figure claims: the implementation MUST have observed the counter covering that domain advance under load (for Apple IOReport: the CPU energy rail itself advancing in at least 5 sample intervals, in at least 4 of every 5, over at least 300 ms while the probing thread burns CPU). A counter that is present but not live - frozen, or republished in lumps - MUST NOT produce a hardware-graded figure; the implementation falls back to its estimator or reports the work unmetered, and SHOULD record why. A figure MUST NOT claim coverage of a domain its counter does not read; where the format has a coverage field, such a figure is Partial. Joule Code - spec/receipt.md §2 (REQUIRED): HwShunt now reads "an external shunt, or a vendor energy counter (RAPL, NVML, Apple SMC/IOReport) while that counter is live"; the rule above is added verbatim, and in this receipt the hardware grade is a present measured_uj and the HwShunt tag, so a counter that is not live supplies neither. The §1 comment and §5 say "live". - SPEC.md §6: the provenance definition now names IOReport and NVML beside RAPL/SMC, measured_uj comes only from an interface live for the domain it claims, and a paragraph states the MAY/MUST NOT, pointing to receipt.md §2 for the test. The §9 readiness row says "live" and "not live". - ROADMAP.md v0.2 "Measured energy": a vendor counter feeds the HwShunt path only while live; where it is present but not live (IOReport's CPU rails to an unprivileged reader on macOS 27) the receipt stays on the estimator. - examples/l3-jouleclaw/README.md: the claim that the receipt is "a real local measurement ... (HwShunt on RAPL/NVML hosts; Estimator on Apple Silicon until IOReport is wired)" was wrong both ways: run.rs wires only Apple Silicon's counter, and other hosts fall to the token Estimator. It now says so, that the counter's own tag is carried, and that HwShunt needs a live counter. - joule-code-receipt: the Provenance::HwShunt doc comment says the same. - CHANGELOG.md [Unreleased] ### Changed: the rule; no wire or vector change. Sense - SPEC.md §7 (REQUIRED): measured_uj comes only from a live interface; the rule is added verbatim. The Sandbox PowerMeter was described as "(real RAPL/IOReport)"; it is now described as grading a reading HwShunt only while its counter is live and falling back to its estimator otherwise, which is what origin/sandbox-meter/cpu-rail-liveness implements. §10's Sandbox edge says the same in brief. - sense-schema: the HwShunt, Energy and Energy::measured doc comments say a vendor counter is a hardware reading only while live. - Sense keeps no CHANGELOG, so none is added. Other specs that grade vendor counters - map/spec/receipt.md §2: the HwShunt row read "RAPL/SMC/shunt"; it now names a counter "while it is live", and the rule is added verbatim, noting that Receipt::seal cannot check liveness (the meter's duty, upstream). map/SPEC.md §6 states the MUST NOT and points there. CHANGELOG.md gains an [Unreleased] ### Changed entry; no wire or vector change. - arl/ARL-S.md, Telemetry: physical telemetry is what gates tiers above 0, and it said energy is "measured directly via RAPL ... NVML". The rule is added in ARL-S's own terms and lower-case keywords (ARL uses no RFC 2119 capitals): a counter that is not live does not produce physical telemetry, the energy it would have covered is reported unmetered, and the Supervisor must have observed the counter advance. No version bump. - smart-byte treatise §8.6: "Where RAPL or equivalent hardware energy counters are available, the measurement is read from the hardware" now requires the counter to be demonstrably live, and a frozen or lump- republished counter yields the same honest zero as an absent one. Text and doc comments only: no code path, wire format, or conformance vector changes. joule-code-rs (joule-code-receipt, joule-code-conformance) and sense-rs (sense-schema, sense-conformance) build and test clean, their rustdoc builds under -D warnings, map-rs (map-receipt, map-conformance) tests pass, `joule-code-conformance verify ../conformance/v1` passes 24/0/0, the no-vanity-metrics check passes, and every relative link in the changed Markdown resolves. Co-Authored-By: Claude Opus 5.5 <[email protected]>
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Markdown
66 lines
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Markdown
# Map sub-spec — The receipt
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Normative refinement of [SPEC §6](../SPEC.md). Reference: `map-receipt`.
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Every resolve/decode of a tile emits a signed energy receipt. Receipts seal as
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**JCR-1** envelopes — the family's shared signed-receipt format (canonical
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det-CBOR + COSE_Sign1/EdDSA, `alg = -8`) — so a Map receipt verifies with the
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same tooling as a Joule Code, Sandbox, or JouleClaw receipt. The JCR-1 wire
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profile is `"map/1"`.
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## 1. Shape
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```
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Receipt = {
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cell: CellKey, // rendered as its content id on the wire
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content_id: ContentId, // the tile that closed the request
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tier: Tier, // F0..F4 — the closing tier
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energy: { measured_uj: Option<u64>, estimated_uj: u64, provenance },
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sequence: u64,
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nonce: [u8; 8],
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}
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```
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## 2. The provenance coupling (REQUIRED)
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| Provenance | `measured_uj` | Meaning |
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|--------------|---------------|---------|
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| `HwShunt` | **required** | Read from a hardware energy interface (shunt, or a RAPL/NVML/SMC/IOReport counter while it is live — below). |
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| `ModelBased` | optional | Computed from a calibrated per-operation model. |
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| `Estimator` | **forbidden** | A coarse constant; honestly flagged as not measured. |
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`Receipt::seal` validates this coupling *before* signing, so a dishonest receipt
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(`HwShunt` with no measured figure; `Estimator` carrying one) cannot be sealed
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(conformance **C-neg**). The spec never claims an accuracy the platform cannot
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deliver.
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A reading from a vendor energy counter (RAPL, NVML, Apple IOReport, ...) **MAY**
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be graded as a hardware reading (`HwShunt`, with `measured_uj`) only while the
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counter is demonstrably live for the domain the figure claims: the implementation
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**MUST** have observed the counter covering that domain advance under load (for
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Apple IOReport: the CPU energy rail itself advancing in at least 5 sample
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intervals, in at least 4 of every 5, over at least 300 ms while the probing
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thread burns CPU). A counter that is present but not live — frozen, or
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republished in lumps — **MUST NOT** produce a hardware-graded figure; the
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implementation falls back to its estimator or reports the work unmetered, and
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**SHOULD** record why. A figure **MUST NOT** claim coverage of a domain its
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counter does not read; where the format has a coverage field, such a figure is
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Partial. `Receipt::seal` cannot check liveness; that duty is the meter's,
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upstream of the receipt.
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## 3. Reference estimator (non-normative)
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Microjoules per resolved tile, ordered by tier — `map_receipt::UJ_BY_TIER`:
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| Tier | µJ (order of magnitude) |
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|------|--------------------------|
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| F0 Cache | 1 (picojoules) |
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| F1 Base | 1 000 (microjoules) |
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| F2 Field | 200 000 (sub-millijoules) |
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| F3 Feature | 5 000 000 (millijoules) |
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| F4 Photoreal | 2 000 000 000 (joules) |
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A session's total cost is the sum of its tile receipts. The standard is that the
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figure is **reported and honestly tagged** — not the constant. Conformance suite
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**C5** pins receipt sealing, verification, and the signed core in
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[`../conformance/v1/receipt_vectors.json`](../conformance/v1/receipt_vectors.json).
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