Module baseline 

Accepted baselines and the regression policy. A baseline is a tracked result document of one platform (os-arch-buildprofile), promoted explicitly from a local run by bench baseline update; the policy is data in .ai/repo/benchmarks/rust/policy.yaml (the shell tool keeps its own evidence beside it, under .ai/repo/benchmarks/). A check compares each measurement of a run with the baseline’s under the policy and reports every line; a target the baseline knows and the run does not is reported as stale, never silently attached to something else, and a baseline of another platform is not compared at all.

A budget is the other half of the policy: an absolute bound on a metric of every target under a prefix (budgets: in the same file). A regression threshold asks whether a target got slower than it was on this host; a budget asks whether it is fast enough at all, which no baseline can answer, since a target that was always too slow never regresses. A budget therefore needs no baseline and is held on every host.

Structs

Budget

An absolute bound on one metric of every target whose key starts with a prefix.

BudgetLine

One measurement held against a budget.

Check

The outcome of a check.

CheckLine

One line of a check.

Policy

The regression policy.

Threshold

One threshold: a relative increase allowed on a metric.

Constants

BASELINE_DIR

Where the Rust executable’s baselines and policy live, relative to the tracked half.

POLICY_FILE

The policy file’s name.

Functions

baseline_path

.ai/repo/benchmarks/rust/baseline.<platform>.json.

load_baseline

Read a baseline, when there is one for the platform.

policy_path

.ai/repo/benchmarks/rust/policy.yaml.

write_baseline

Promote a run to the baseline of its platform. The tracked copy carries no machine-local path; it is the run’s document as it is.