ci: on-demand TLA+ model check workflow + fast profile - #58
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Not a default PR gate — the full model is ~85M distinct states (~18 min on 12 perf cores, 60-90 min on a standard runner): - workflow_dispatch (full by default, fast selectable) — the receipt for spec changes - pull_request touching tla/**: fast profile automatically (~3M states, minutes) as a non-required smoke signal - nightly full run on main for spec/code drift Viaduck.fast.cfg = MaxOps 3 (~28x smaller; 55s locally, all 7 invariants). tla2tools pinned + cached; log uploaded as artifact with a step summary. just tlc-fast mirrors the profile locally.
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What
GitHub Actions workflow for the TLA+ spec check — deliberately not a default PR gate (the full model is ~85M distinct states: ~18 min on 12 local perf cores, 60–90 min on a standard 4-vCPU runner):
workflow_dispatchfastselectable)tla/**Viaduck.fast.cfgis the new smoke profile:MaxOps 3, ~3M distinct states, 55s locally, all 7 invariants — validated green before this PR. The fullViaduck.cfgstays authoritative for spec changes; the two files are identical exceptMaxOps(noted in the header comment).just tlc-fastmirrors it locally.Mechanics:
tla2tools.jarpinned (v1.7.4) + cached, temurin 21,-workers auto, log uploaded as an artifact with the state-count/verdict lines in the step summary — the "did anyone actually run TLC?" review question becomes a link.Cost
Standard runner private-repo minutes: fast ≈ pennies, full ≈ $0.50–0.75/run. If the full run's wall time ever matters,
runs-oncan point at a larger runner (16-core ≈ 15–20 min, ~$1.30/run) — left onubuntu-latestuntil someone cares.