[TRTLLM-15302][fix] Reject dead prefetched MPI pools - #17642
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Rebased and revalidated — exact RTX Pro stage requested. The waiver conflict was resolved by preserving this PR’s intended removal of the two NVBug /bot run --extra-stage "RTXPro6000D-PyTorch-1" |
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WalkthroughThe prefetcher validates worker identities before reuse, asynchronously abandons pools with dead workers, and falls back to synchronous creation. Tests cover missing and recycled processes. Two ChangesSession prefetcher reliability
LagunaXS test waivers
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The change rejects dead prefetched worker pools and falls back to a fresh pool, but cleanup currently catches all exceptions and could hide unexpected failures. This is a bounded follow-up risk that should have explicit owner awareness before merge. Sequence Diagram(s)sequenceDiagram
participant Caller
participant SessionPrefetcher
participant MPISession
participant PrefetchedPool
Caller->>SessionPrefetcher: take()
SessionPrefetcher->>MPISession: Check worker identities
MPISession-->>SessionPrefetcher: Return current worker records
SessionPrefetcher->>PrefetchedPool: Abandon and shut down stale pool
SessionPrefetcher-->>Caller: Return None for synchronous creation
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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In `@tests/unittest/llmapi/test_session_prefetcher.py`:
- Around line 308-340: Register unittest/llmapi/test_session_prefetcher.py in
l0_cpu.yml, then run pytest tests/unittest/ and report the test results.
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📒 Files selected for processing (3)
tests/integration/test_lists/waives.txttests/test_common/session_prefetcher.pytests/unittest/llmapi/test_session_prefetcher.py
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Signed-off-by: Bowen Fu <5812640+BowenFu@users.noreply.github.com>
The prefetcher tests are pure logic with no MPI or GPU requirement, but were absent from the CPU pre-merge list, so they never ran in CI. Signed-off-by: Bowen Fu <5812640+BowenFu@users.noreply.github.com>
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Root cause found — the repeated red was environmental, not PR-side. The Fixed on main by #18004 (pins Thanks for the manual reruns earlier; they were hitting this wall regardless of the diff. |
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PR_Github #67811 [ run ] triggered by Bot. Commit: |
_FakePool only set `abandoned` inside abandon(), so a pool that was never abandoned had no such attribute. `assert not pool.abandoned` would then raise AttributeError instead of failing the assertion, which hides the real signal if a regression stops routing dead-pool teardown through abandon(). Signed-off-by: Bowen Fu <5812640+BowenFu@users.noreply.github.com> Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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9 participants
Draft — exact RTXPro validation is pending.
Dev Engineer Review
(pid, start_time).TestLagunaXSwaiver entries.QA Engineer Review
tests/integration/test_lists/test-db/l0_cpu.ymlincludes the test file for CI coverage.Description
Fixes NVBug 6596064. A published session-prefetch pool could lose its worker before handoff; executor initialization then queued work to no process and waited until the 3,600-second test timeout.
Require the complete recorded
(pid, start_time)set to still match live processes. Dead pools are abandoned, a fresh synchronous pool is created, and the matching waiver is removed. No timeout or resource limit changes.Test Coverage
RTXPro6000D-PyTorch-1with the unwaived sequence.The local host lacks
torch, so one unrelated construction-site source scan was deselected.PR Checklist