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Devin FoleyandClaude
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## Thinking Path > - Paperclip is the open source app people use to manage AI agents for work > - Its PR CI runs the general-server vitest lane pinned to `maxWorkers=1` and sharded across 3 runners (introduced in #8360) > - Suites were assigned to shards round-robin by sorted file index, so shard test time was unbalanced: a recent PR run split 73s / 153s / 115s, and the heaviest shard made "General tests (server 2/3)" the slowest check in the whole workflow at 314s wall > - The slowest shard sets the lane's wall time, so unbalanced partitions waste the other two runners and stretch the PR critical path > - This pull request replaces the round-robin assignment with a deterministic longest-processing-time partition weighted by a checked-in per-suite duration manifest > - The benefit is near-even shard weights (projected 113s / 113s / 113s with the current manifest), taking roughly 40s off the PR critical path with no reduction in coverage ## Linked Issues or Issue Description - Refs #8360 (introduced the 3-way general-server sharding this PR rebalances) - No public issue exists. Problem: the general-server test lane's round-robin shard assignment ignores per-suite duration, so one shard can carry multiple 30s+ suites while another finishes in half the time; the slowest shard alone determines the check's wall time. ## What Changed - `scripts/general-server-shard.mjs` (new): manifest loader and deterministic LPT (longest-processing-time) partitioner; suites missing from the manifest get the median recorded weight, and a missing or malformed manifest degrades to uniform weights so the lane never fails on stale data - `scripts/general-server-shard-durations.json` (new): per-suite duration manifest sampled from a real PR run (240 suites); the `$comment` field documents how to regenerate it - `scripts/run-vitest-stable.mjs`: both shard-selection sites (run and `--dry-run`) now use the balanced partition instead of index round-robin - `scripts/__tests__/run-vitest-stable-shard.test.mjs`: 6 new tests covering skew-balance vs round-robin, determinism, median fallback for unlisted suites, malformed-manifest degradation, manifest coverage of the current suite set, and real-partition balance - `server/src/__tests__/heartbeat-issue-rewake-throttle.test.ts`: hardened the `afterEach` sweep — post-run bookkeeping (run-event records, follow-up wake scheduling) can still insert rows briefly after a run reaches a terminal status, and a late insert landing between the `agent_wakeup_requests` and `agents` deletes failed teardown with a foreign-key violation on the first CI attempt of this PR; the sweep now retries so a late background write cannot take down the shard - `release-verify.yml` shares the same runner script and inherits the balancing with no workflow change ## Verification - `node --test scripts/__tests__/run-vitest-stable-shard.test.mjs` — 9/9 pass (run against current master) - `npx vitest run src/__tests__/heartbeat-issue-rewake-throttle.test.ts` — 6/6 pass against embedded Postgres with the hardened teardown - `node --test scripts/__tests__/release-verify-workflow.test.mjs` — 2/2 pass - `node scripts/run-vitest-stable.mjs --dry-run` with each shard flag shows every suite assigned exactly once across the 3 shards, with projected weights ~113s each ## Risks - Low risk: partition changes which runner executes which suite, not what runs; a completeness test asserts every suite is assigned to exactly one shard - The duration manifest will drift as suites are added/changed; unlisted suites get the median weight and a coverage test flags when the manifest covers less than half the suite set, so drift degrades balance gracefully rather than breaking the lane > For core feature work, check [`ROADMAP.md`](ROADMAP.md) first and discuss it in `#dev` before opening the PR. Feature PRs that overlap with planned core work may need to be redirected — check the roadmap first. See `CONTRIBUTING.md`. ## Model Used - Claude Fable 5 (`claude-fable-5`, Anthropic), extended thinking enabled, agentic tool use (file edits, shell, test execution) via Claude Code ## Checklist - [x] I have included a thinking path that traces from project context to this change - [x] I have specified the model used (with version and capability details) - [x] I have checked ROADMAP.md and confirmed this PR does not duplicate planned core work - [x] I have searched GitHub for duplicate or related PRs and linked them above - [x] I have either (a) linked existing issues with `Fixes: #` / `Closes #` / `Refs #` OR (b) described the issue in-PR following the relevant issue template - [x] I have not referenced internal/instance-local Paperclip issues or links (only public GitHub `#NNN` / `github.com/paperclipai/paperclip` URLs) - [x] My branch name describes the change (e.g. `docs/...`, `fix/...`) and contains no internal Paperclip ticket id or instance-derived details - [x] I have run tests locally and they pass - [x] I have added or updated tests where applicable - [x] I have updated relevant documentation to reflect my changes - [x] I have considered and documented any risks above - [x] All Paperclip CI gates are green - [x] Greptile is 5/5 with no open P2s, recommendations, or follow-ups - [x] I will address all Greptile and reviewer comments before requesting merge --------- Co-authored-by: Claude (Paperclip SWE) <noreply@paperclip.ing>