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open-standards/proof/proof-rs/Cargo.lock
Transaction Science effb4e3c8e proof-solvers: read each resident z3 decision off z3's own process tree 
Z3Server::attempt sealed wall time x 15 W (ModelBased) on every OS, though
the decision runs in a resident z3 child whose CPU energy this host's kernel
counts per process. Each decide() is now spanned with sandbox-meter's
TreeMeter on the resident z3's pid (built once with the session, so the
counter's liveness probe never lands on a goal), and the attempt is sealed
HwShunt at the reading, rounded up to the uJ, only when the reading has no
gap at all and the decision ran entirely in the tree. The code spawned z3
itself and z3 is a single-process solver that hands no work elsewhere: that
is the in-code equivalent of jcp-gateway's operator declaration, and the
docs say so and where it ends.

Every other case keeps today's model figure and says why, in-process
(Z3Server::last_account): a gapped reading (Energy has no coverage field,
so a partial reading sealed HwShunt would claim the whole decision), no
reading, no tree meter (Linux, or the counter not live), a goal that never
reached z3, and a refutation, whose counter-model a one-shot z3 fetches
outside the resident tree after the span has stopped. The model figure now
times the solver's work alone, never the meter's settling.

Measured on an M5 Max at load ~150: every reading equal to an independent
proc_pid_rusage oracle on the z3 pid to the nanojoule; under the default
50 ms bound 30 of 30 decisions read whole, metering overhead per goal
median 2.5 ms, p90 4.7 ms, max 34 ms. The bound is configurable
(with_settle_bound). The dependents' lockfiles gain sandbox-meter.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
2026-10-10 18:11:21 -04:00

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