[https://nvbugs/6607481][fix] Isolate stateful KV-cache comparison - #17673
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Signed-off-by: Bowen Fu <5812640+BowenFu@users.noreply.github.com>
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Included review availability: Your plan includes up to 12 reviews per rolling hour; 11 remain after this review. WalkthroughThe change enables a KV-cache scheduler test by removing its waiver and assigning it to a private MPI session. Private MPI node-ID pattern matching is now case-insensitive. ChangesKV-cache session reuse
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: ⚪ Minimal · up to The PR isolates the affected KV-cache comparison test with fresh private sessions and removes its waiver; required validation passes, so no actionable merge-blocking risk remains beyond normal checks and review. 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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Actionable comments posted: 1
🔇 Additional comments (2)
tests/test_common/session_reuse_hooks.py (1)
25-28: LGTM!tests/unittest/llmapi/test_session_reuse.py (1)
334-343: 📐 Maintainability & Code Quality
⚠️ Unverified finding
Sandbox verification was unavailable.Verify test-list coverage for the new test.
Test coverage summary:
- Added test:
test_stateful_kv_cache_compare_nodeid_is_private.- Covered cases: the target KV-cache node ID is private; the sibling block-reuse node ID is non-private.
- Test-list membership: not verifiable from the supplied files for
tests/integration/test_lists/test-db/andtests/integration/test_lists/qa/.- Coverage verdict: needs follow-up because no
cbts_touchmap.sqliteor CBTS coverage report is provided.Confirm the test-list entries and the required
pytest tests/unittest/validation before merge.
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Inline comments:
In `@tests/unittest/llmapi/test_session_reuse.py`:
- Line 334: Add the return annotation -> None to the
test_stateful_kv_cache_compare_nodeid_is_private function definition, preserving
its existing behavior.
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tests/integration/test_lists/waives.txttests/test_common/session_reuse_hooks.pytests/unittest/llmapi/test_session_reuse.py
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- tests/integration/test_lists/waives.txt
brnguyen2
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Approving — the comments below are optional touch-ups, not blockers.
The isolation is the narrow, safe move and the waiver is fully removed (no other entry for this nodeid remains). Two things for the record:
- Per-nodeid opt-out is a band-aid for a general weakness: the reuse cache revalidates a pool with an MPI-liveness probe that says nothing about the executor IPC lane. Any pool-reusing test can hit the same silent-worker hang, so this list will keep growing. Worth a follow-up ticket to make the health check exercise the executor lane (or cap reuse for tests that build multiple LLMs).
- https://nvbugs/6607481 records mixed signatures on this nodeid (hang, assertion failure, OOM), not just the reuse hang. Unwaiving may bounce on the non-hang ones; the Limitations section already says as much, so just be ready to re-triage rather than re-waive blindly.
Signed-off-by: Bowen Fu <5812640+BowenFu@users.noreply.github.com>
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@pytest.mark.private_mpi_session
def test_chunked_prefill_eviction_block_reuse(self):
We can use this method to skip mpi reuse for specific test
Signed-off-by: Bowen Fu <5812640+BowenFu@users.noreply.github.com>
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@cascade812 @zhaoyuanh-nvidia @schetlur-nv @mlefeb01 @yuanjingx87 — friendly review ping when you have time. The latest CI failure is being tracked separately. Thank you! |
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Signed-off-by: Bowen Fu <5812640+BowenFu@users.noreply.github.com>
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Note GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer. |
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4 participants
Draft — exact current head passed both required DGX B200 stages; unrelated B300 DSA abort remains.
Description
NVBug 6607481 captured a DGX B200 hang in the V1 leg of
test_chunked_prefill_eviction_block_reuseafter the harness handed it a one-worker MPI pool on reuse#8. Standalone fresh-pool runs pass. The shared-pool probe proves MPI responsiveness, but it cannot prove that executor state left by older LLM instances is safe for another stateful V1/V2 cache-manager comparison.This opts only that exact nodeid into the existing private-session policy. The cache is drained before the test, and both V1 and V2 legs receive fresh private pools. It also removes the temporary waiver so CI exercises the test again. The change does not increase timeouts, lower capacity, or weaken assertions.
Test Coverage
2 passed, including the exact nodeid and a non-private sibling.git diff --check: passed.3d62778— PR_Github #66171 / L0 pipeline #53843:SUCCESSwith56,153 passed,0 failed, and15,766 skipped.87ccd3fchanges only test annotation and pattern casing. Seven direct classification assertions, exact-head GitHub checks,git diff --check, and current-main merge simulation pass.59,680 passed,20 failed, and15,717 skipped. RequiredDGX_B200-PyTorch-1and mappedDGX_B200-PyTorch-5both passed with no retry or failed test. The aggregate failed only after unrelatedB300-PyTorch-1sparse-attention DSA tests aborted withSIGABRT; CI agent analysis says no PR code change is indicated.3d62778, the exact formerly waivedtest_chunked_prefill_eviction_block_reusenodeid completed asFIXEDin50.266son its mappedDGX_B200-PyTorch-5shard. The requestedDGX_B200-PyTorch-1stage also passed.upstream/mainmerge simulation is conflict-free.Limitations
The original shared-pool hang remains intermittent and was not reproduced locally. This fix deliberately isolates the captured state-leak path; any distinct assertion or OOM signature should be tracked separately rather than hidden by this policy.
PR Checklist
Draft limitation: The original shared-pool hang remains intermittent and was not reproduced locally; maintainer acceptance of targeted private-session isolation as the final fix is still required.
Dev Engineer Review
private_mpi_sessiontotest_chunked_prefill_eviction_block_reuse.waives.txt.QA Engineer Review
TestKVCacheV2Llama::test_chunked_prefill_eviction_block_reuse.test-db/orqa/files were modified.