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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