Files
gstack/test
Garry TanandClaude Fable 5 b4cc808ba1 feat(test): duration-aware LPT shard packing for the free suite
Hash sharding balances file COUNTS (1.15x spread) but not cost — the
Playwright-launching files landed 4/3/4/1/2/1 across 6 shards, giving a
measured 28s–97s shard spread and ~40s of idle tail on every run.
Full-suite mode now packs by recorded per-file durations
(longest-processing-time-first) when the committed seed
scripts/free-test-durations.json exists.

- ONE store, no overlay: the seed is refreshed occasionally via the new
  --record-durations mode (each file timed in its own child — exact,
  and immune to bun's stream buffering, where silent passers print no
  header to timestamp); GSTACK_FREE_TEST_DURATIONS overrides the path
  for experiments; CI never records
- seed is a hint: missing → silent hash-shard fallback; corrupt (bad
  merge) → one warning + fallback; unknown files → 75th-percentile
  pessimism so a surprise long-runner can't recreate the tail
- packed shards get duration-aware walls (max(base, predicted x 3)) —
  LPT decouples count from cost BY DESIGN, so the 5s/file heuristic
  would undersize a shard holding few expensive files
- one log line per shard (files + predicted seconds) so packing
  regressions are diagnosable from any run log
- the --shard CI-matrix path is untouched: stable hash indices are its
  contract
- successor note in-code: bun >=1.3.14 ships native --timings/--shard
  LPT — swap this packer when the repo unpins 1.3.13

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-29 05:08:21 +00:00
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