Benjamin Taylor 6a35e3cdbf perf(release): cut canary publish wall-clock roughly in half ...

The canary flow took ~11.5 min steady-state (and 20 min in an observed
run). Measured from run 30473499191, the time went to five avoidable
places rather than to real work.

1. `npx --yes npm@11.15.0 publish` ran per package, and npx re-resolves
   the spec against the registry on EVERY invocation: ~16s of each
   package's ~21s. A 9-package channels canary paid ~2.4 min of pure npx
   overhead; a 16-package monorepo release paid over 4 min. Hoist the
   pinned npm into lib/npm-cli.ts, install it once into a throwaway
   prefix, and reuse the binary.

2. publish-release.yml was the only workflow in the repo with no pnpm
   store cache, so all three jobs installed 4608 packages cold every
   time. Usually ~45s each, but registry-bandwidth bound and heavy
   tailed: the observed run spent 9m08s here on tarballs arriving at
   2-49 KiB/s. Add the same node-version-keyed cache the rest of CI uses.

3. The notify job ran for canaries only to compute "post nothing" — the
   builder already returns should_post=false for mode=prerelease and the
   self-watchdog is already gated off. ~85s of dead work on the critical
   path, since canary.yml waits for the whole run. Skip the job, keeping
   it reachable for a python_publish dispatch.

4. The build job fetched full history for canaries, which need none (no
   tag, no GH Release, no release-note commit range, and `nx run-many`
   resolves no merge base). That rode along in the 837 MiB workspace
   artifact too. Shallow-fetch prereleases; stable keeps depth 0 because
   its publish job pushes tags out of that artifact's .git.

5. Two smaller ones: the artifact was gzipped and then re-deflated into
   the artifact zip (compression-level: 0), and the orchestrator's
   run-discovery loop slept 6s before its first poll.

Verified: 143 release-script tests pass (6 new for the npm-cli helper),
actionlint + shellcheck + the scope-dropdown guard are clean, the
prerelease dry-run path still enumerates all 9 channels packages, and a
live probe confirms the helper installs npm 11.15.0 once (3.2s) and
memoizes thereafter (0ms).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

2026-07-29 19:29:38 -05:00

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