[None][feat] perf-sanity: upload per-request disagg lifecycle spans to OpenSearch

[chenfeiz0326]

What this PR does

Re-lands #18445 (perf-sanity time_breakdown modifier: per-request disagg lifecycle spans uploaded to OpenSearch as 108 diagnostic d_tb_* fields), which was reverted in #18736.

Everything in #18445's non-test code is restored unchanged apart from three merge-conflict resolutions against current main. See #18445 for the full feature description (test-id grammar, the stdlib-only aggregator, the upload path, and the metric/regression tables).

No unit tests for the perf harness. A suite of unit tests existing solely to protect a perf test script is not worth the CI resources to maintain, so this PR adds none, reverts the ones #18445 touched, and deletes the pre-existing one that the revert tripped over.

The shipped tensorrt_llm/serve/ fix does get tests. That code is a different risk category, so the one behavioural change in perf_metrics.py is pinned by two cases in tests/unittest/llmapi/apps/test_request_metrics.py, registered on l0_cpu by node id. Details under Shipped behaviour change and Review findings addressed.

Why it was reverted

Post-merge CI failed with:

FAILED tests/unittest/tools/test_perf_sanity_matching.py::
       test_warmup_is_derived_from_exactly_the_e2e_and_ctx_only_modes
ModuleNotFoundError: No module named 'defs.perf.time_breakdown_metrics'

That test was not one of #18445's — it arrived two days earlier in #18432, in a file #18445 never touched (provenance confirmed via the GitHub API, not git log, which misreports added-in commits in a shallow clone). This was a semantic merge conflict: both PRs were green in isolation and red together.

#18432 added a _load_module() helper to test_perf_sanity_matching.py that execs tests/integration/defs/perf/test_perf_sanity.py by file path under a synthetic defs.perf package, so a CPU-only job never imports torch or the OpenSearch client:

perf_pkg = stub("defs.perf")
perf_pkg.__path__ = []          # <-- nothing can be resolved through the package
stubs = { "defs.perf._model_paths": ..., "defs.perf.open_search_db_utils": ..., ... }

The stub package had an empty __path__ plus a closed allowlist of stub siblings in sys.modules. #18445 added a new real sibling, time_breakdown_metrics, and imported it from test_perf_sanity.py (from .time_breakdown_metrics import ..., resolving to defs.perf.time_breakdown_metrics). Not in the allowlist, not reachable through an empty __path__ — so the import raised. Under that shape, every future stdlib-only sibling added to defs/perf/ would break that file until someone added a stub for it.

Reproduced and isolated with a negative control before changing anything: current main's test_perf_sanity.py passes the test; #18445's fails it with exactly the CI error.

The resolution

tests/unittest/tools/test_perf_sanity_matching.py is deleted, removing the failure at its source rather than teaching that harness about one more sibling.

Nothing else inherits the pattern: others/test_perf_regression_branch.py uses the same empty-__path__ stub shape but loads perf_regression_utils.py, which imports only open_search_db_utils — verified still green (19 passed). tests/test_common/perf_sanity_matching.py, the helper that file exercised, is kept: it is imported by defs/perf/test_perf_sanity.py:35 and defs/perf/open_search_db_utils.py:26 and is production perf-harness code.

Two bookkeeping entries went with the file, both required:

file	change	why
test-db/l0_a10.yml	drop the unittest/tools/test_perf_sanity_matching.py entry	that stage makes one pytest invocation per entry, so an entry naming a file that no longer exists errors the stage. check_test_list.py --validate does not catch this — it returned OK on an injected nonexistent path — so its green is not evidence here
defs/.test_durations	drop the stale 23.07 key	JSON re-validated, 1603 entries

On unit tests

Every perf-sanity-related unit test change is out. tests/unittest/ in this PR is byte-identical to main except for the one deletion above and the two cases added for the shipped perf_metrics.py fix.

file	disposition
tools/test_perf_sanity_matching.py	deleted (pre-existing, 499 lines)
others/test_perf_sanity_time_breakdown.py	not added (would have been 778 new lines)
others/test_time_breakdown_metrics.py	not added (would have been 525 new lines)
scripts/test_perf_submit.py	reverted to main
scripts/test_perf_sanity_helpers.py	reverted to main
others/test_cache_transceiver_precheck_config.py	reverted to main
others/test_time_breakdown.py	reverted to main
llmapi/apps/test_request_metrics.py	two cases added for the shipped perf_metrics.py KV-transfer fix. Its nine pre-existing cases are untouched
test-db/l0_cpu.yml	registers only those two cases, by node id. The file itself appears on no test list and llmapi/apps is enumerated per file rather than as a directory, so registering the file would have started running its dozen pre-existing cases for the first time — a separate change

The PR still changes code that main's restored tests assert against (jenkins/scripts/perf/submit.py, test_perf_sanity.py), so reverting the test files risked leaving assertions that encode pre-change behaviour. Checked rather than assumed — main's restored suites re-run against this PR's code:

suite	result
scripts/test_perf_submit.py	82 passed (0.14 s)
others/test_cache_transceiver_precheck_config.py	55 passed (13.3 s)
others/test_perf_regression_branch.py	19 passed (0.02 s)

scripts/test_perf_sanity_helpers.py, others/test_time_breakdown.py and llmapi/apps/test_request_metrics.py cannot run in this environment (no numpy; torch._inductor unavailable) and are left to CI. The first two are byte-identical to main, so CI runs exactly what it runs today; the third gains two cases, verified by the differential probe described below instead of by pytest.

What this costs, stated plainly: the 902-line stdlib-only aggregator time_breakdown_metrics.py now gets its first exercise on a GB300 allocation. The d_tb_* path cannot fail a build (see below). tensorrt_llm/serve/perf_metrics.py is shipped library code, so its one behavioural change is covered — spelled out next.

Shipped behaviour change

tensorrt_llm/serve/perf_metrics.py carries a real fix, not just plumbing. Since pytest cannot run here, _jsonl_perf_metrics was extracted from both revisions by AST, exec'd against stub annotations, and diffed over four records. Exactly one case differs:

record	main	this PR
kv_cache_transfer_start/end populated, kv_cache_size absent	{'arrival_time': 1.0}	{'arrival_time': 1.0, 'kv_cache_transfer_start': 5.5, 'kv_cache_transfer_end': 5.7}

kv_cache_size is worker-local and never reaches a header-derived record, so on main the KV-transfer timestamps were discarded for every disaggregated request, zeroing that span. The falsy test rather than is None is belt-and-braces: both producers already yield None for an absent timestamp (_as_seconds maps <= 0 to None, and the header path emits a field only when the header carried it), and a populated timestamp is a steady-clock reading so it is never 0.

main's own fixture carries None for both timestamps, which is dropped under either revision, so this path had no coverage at all. Two cases now pin both halves of the gate:

test	pins
test_header_derived_record_keeps_kv_transfer_without_kv_cache_size	a header-derived disagg record keeps both timestamps even though it can never carry kv_cache_size — the bug itself
test_unpopulated_kv_transfer_timestamps_stay_absent	an unpopulated timestamp stays absent rather than being written as 0.0, so a consumer testing presence cannot read a zero-width transfer as real

pytest cannot run in this environment, so both were driven against three revisions of perf_metrics.py loaded side by side: this branch, origin/main, and this branch with only the old kv_cache_size-keyed gate restored. That third revision is the isolating control — it has the new header transport, so a failure there can only come from the gate under test.

test	this PR	origin/main	gate-only control
keeps KV transfer without kv_cache_size	PASS	FAIL (no kv-start header)	FAIL (kv_cache_transfer_start DROPPED)
unpopulated timestamps stay absent	PASS	PASS	PASS

The second row passing everywhere is reported as-is: it is a regression guard, not a differential.

Deviations from a plain revert-of-the-revert

Rebased onto main at 3bd8e8b129. Three resolutions:

file	resolution
defs/perf/test_perf_sanity.py	#18608 (checkpoint I/O experiment + startup telemetry, +653/−7 to this same file) added get_job_info to the perf_regression_utils import that this PR also edits. Resolved as a union: from .perf_regression_utils import _percentile, get_job_info, process_and_upload_test_results, followed by this PR's time_breakdown_metrics imports. Everything else in the file auto-merged.
l0_gb300_multi_gpus_perf_sanity.yml	Keep main's 120-minute budget for the con4301 ctx_only case (#18859, nvbugs/6682113 — that bump is specific to con4301's workload). Re-add the time_breakdown con666 lane at 90, the budget its own base lane carries.
waives.txt	Left byte-identical to main. main no longer waives nvbugs/6661856 and the con8 base lanes now run, so the time_breakdown sibling is not re-waived either.

Because #18608 and this PR both add several hundred lines to test_perf_sanity.py, a clean auto-merge is exactly where a silent semantic conflict would hide. Checked rather than assumed:

• Line-count identity. merge-base 3173 + main's net +646 + this PR's net +667 = 4486, which is the merged file's exact length. No hunk dropped or applied twice.
• Symbol superset. Top-level defs/assignments in the merged file are a superset of both parents. The only two names present on main and absent from the merge, GEN_ONLY_PERF_METRIC_LOG_QUERIES and GEN_ONLY_DEVICE_STEP_TIME_METRICS, are renamed by this PR to DEVICE_STEP_TIME_LOG_QUERIES / DEVICE_STEP_TIME_METRICS (the metrics are no longer gen_only-exclusive; the uploaded gen_worker field names are deliberately unchanged so OpenSearch baselines are not forked). [TRTLLM-15448][perf] Add checkpoint I/O experiment and startup telemetry #18608 adds no reference to either old name, and no dangling reference to them remains.
• Both features still wired. STARTUP_METRIC_NAMES / CHECKPOINT_PIPELINE_PHASES (main) and TIME_BREAKDOWN_METRIC_NAMES (this PR) are each still read at their use sites.
• No duplicate top-level definitions; no undefined names; ruff clean.

Post-rebase, test_perf_sanity.py is still +743/−76, and tests/unittest/ is still byte-identical to main but for the one deletion and the two cases added for the perf_metrics.py fix.

Also dropped versus #18445: its change to tests/scripts/perf-sanity/cache_transceiver_precheck/run_precheck.py. That hunk was a five-line comment plus a reflow of one add_argument call — default="e2e" and choices=["e2e", "gen_only"] unchanged — so it was a no-op, and the file is now identical to main. The invariant the comment described is enforced by code anyway: submit.py:374-377 rejects any disagg mode token that is not e2e/gen_only (the modifier is peeled separately from parts[2:]), and precheck_prefix_lines() — the only caller that forms --benchmark-mode — is reached only from the disaggregated branch, so an aggregated id such as ctx_only never invokes the precheck at all.

Lanes this adds

Five time_breakdown lanes, all on deepseek-v4-pro-fp4_8k1k, each sitting next to an unmodified lane it can be read against:

lane list	test id
l0_gb300_multi_gpus_perf_sanity	aggr_upload-ctx_only-time_breakdown-gb300_..._con666_ctx6_dep4_gen1_dep16_eplb384_mtp3_ccb-NIXL
..._ctx12_node1_gpu4_gen1_node2_gpu8	disagg_upload-e2e-time_breakdown-gb300_..._con4301_ctx12_dep4_gen1_dep8_eplb384_mtp1_ccb-NIXL
..._ctx1_node1_gpu4_gen4_node2_gpu8	disagg_upload-e2e-time_breakdown-gb300_..._con8_ctx1_dep4_gen4_tep8_eplb0_mtp3_ccb-NIXL
..._ctx3_node1_gpu4_gen1_node8_gpu32	disagg_upload-e2e-time_breakdown-gb300_..._con180_ctx3_dep4_gen1_dep32_eplb384_mtp3_ccb-NIXL
..._ctx6_node1_gpu4_gen1_node4_gpu16	disagg_upload-e2e-time_breakdown-gb300_..._con666_ctx6_dep4_gen1_dep16_eplb384_mtp3_ccb-NIXL

time_breakdown adds only d_tb_* diagnostics and changes no regression metric, so none of it can fail a build.

Review findings addressed

First round (4dfa175e59)

Two real defects from review, both in this PR's own new code; neither needs a test to be checked, and both were verified with a differential probe against the pre-fix commit rather than by inspection.

1. A non-minted test id was accepted, which is a green gate on an empty selection. test_perf_sanity.py:get_disagg_test_cases mints the time_breakdown modifier for exactly two modes — e2e and ctx_only (grep "time_breakdown=True" returns two call sites, one per mode). But disagg_upload-gen_only-time_breakdown-<stem> is grammatically well-formed, so both id-composing entry points accepted it and submitted the job. The failure mode is the bad one: the job queues, builds, and allocates a multi-node GB300 reservation, then pytest exits no tests ran and every gate reports green. The --config-file path already refused this combination and my own comment there names this exact consequence — the check was simply applied at one of three entry points instead of all of them. It is now applied in _split_modifiers (jenkins/scripts/perf/submit.py) and split_modifiers (jenkins/scripts/perf/local/submit.py), keyed on the same TIME_BREAKDOWN_BENCHMARK_MODES allowlist.

2. discover_perf_metrics_files raised out of the completion gate on a glob/stat race. It called os.path.getsize unguarded on paths it had just globbed. snapshot(), four lines below and in the same poll iteration, already wraps the identical syscall in try/except OSError — and the gate's own docstring says timeout expiry is "a warning rather than an error", so an exception escaping it is the wrong shape. Guarded the same way.

probe	before (1a121db551)	after (4dfa175e59)
four minted ids (e2e+mod, gen_only, ctx_only+mod, ctx_only) through both parsers	ACCEPT	ACCEPT (unchanged)
disagg_upload-gen_only-time_breakdown-<stem> through both parsers	ACCEPT	ValueError in both
discover_perf_metrics_files on a dir with one good file, one empty file, one dangling symlink the glob matches	raises FileNotFoundError	returns the good file, drops the other two

The probe is its own negative control: if the fix over-reached, the four positive-control rows would have flipped too.

Second round (fadd4f5acd)

3. Two independent producers of the same scraped log lines, which defeated a gate. benchmark_serving.py printed Time Breakdown <span> <stat> (ms): lines, and so does the harness's append_time_breakdown_metrics; parse_metrics_from_output resolves duplicates by last-match-wins. That is not merely redundant. test_perf_sanity.py documents that aggregation failures are reported-and-skipped rather than raised because the resulting absence of Time Breakdown ... lines is what check_test_failure hard-fails on — but the client had already printed 12 spans × 4 stats = 48 such lines into the same stdout, so tb_* was never empty and that check could not fire. A failed aggregation would have silently downgraded the uploaded series from 27 spans to 12, with overlapped spans dropped, and no gate would have noticed. The print loop is deleted; compute_statistics is still written as an artifact for anyone passing --save-request-time-breakdown by hand. This also dissolves CodeRabbit's comment about the duplicate-line resolution.

4. compute_statistics' docstring described behaviour the code does not have. It claimed negative durations are kept. They are not: calculate_duration returns 0 when start_time > end_time, so an overlapped span is indistinguishable from an unmeasured one and both are dropped by the duration > 0 filter. Worse, the paragraph's own worked example — step_preprocessing under the overlap scheduler — is not one of the client config's 12 spans at all, so it could never appear in this function's output even without the clamp. The justification cited a span the code never computes, for a clamp that discards the very case it claimed to preserve. Rewritten to say the view is coarse and to point at the perf-sanity aggregator for the signed, per-step and per-chunk view. Behaviour unchanged.

5. The not x vs is None comment in _jsonl_perf_metrics justified itself with a false claim about the aggregated path yielding 0.0 from a default-initialised C++ duration. _as_seconds already maps <= 0 to None. Trimmed to what is true. Behaviour unchanged.

6. Coverage for the shipped fix. Two cases added and registered by node id — see Shipped behaviour change for the tests and the three-revision differential that verifies them.

Two further review comments were checked and are not acted on, with reasons:

comment	disposition
test_perf_sanity_helpers.py:656 vacuous assertion	Moot — reviewed against 3ccaf1fee0; that file is now reverted to main. The point is correct on the merits (the test passes even with errors="replace" removed).
test_perf_submit.py:660 pytest.raises((AssertionError, ValueError))	Moot — same file reverted to main. Also correct on the merits: accepting AssertionError weakens the assertion, since assert disappears under python -O.

Verification

check	result
scripts/test_perf_submit.py, others/test_cache_transceiver_precheck_config.py, others/test_perf_regression_branch.py (all at main)	82 / 55 / 19 passed against this PR's code, re-run after the review fixes (156 total)
test-id probe, both parsers, before/after the review fix	four minted ids still ACCEPT; disagg_upload-gen_only-time_breakdown-… flips from ACCEPT to ValueError
discover_perf_metrics_files probe, before/after	dangling glob match: FileNotFoundError → skipped; good file still returned, empty file still dropped
_jsonl_perf_metrics AST diff, main vs this PR	one intended difference, three agreements (above)
the two new test_request_metrics.py cases, run against this branch / origin/main / this branch with only the old gate restored	PASS / FAIL / FAIL on the dropped timestamp — the gate-only control is the isolating negative control
check_test_list.py --validate on the two new l0_cpu node ids	OK, and non-vacuous: injecting a one-character typo into one of them produced FUNCTION NOT FOUND at the exact yml line, so the validator does resolve function-level ids in that file
pre-commit run --files on all six changed files	all content hooks pass, including ruff-legacy. Six unrelated autofixes that bare ruff check applied to benchmark_serving.py and time_breakdown.py were reverted — both files are on the legacy-files exclude list, so the main ruff hook does not touch them and those reflows would have been scope creep
five time_breakdown test-list ids through the real parse_test_case_name()	all yield time_breakdown=True with the expected runtime/mode; corrupting the modifier segment stops it being read as a modifier, and a bare modifier is rejected
check_test_list.py --validate / --check-duplicate-waives	clean (1961 entries) — reported for completeness only. Negative control re-run after the rebase: injecting unittest/tools/test_this_file_does_not_exist.py still returned OK: 1961 unique test entries validated, rc=0, with the entry count unchanged. It also does not cover perf-sanity parametrized ids (190 are reported UNVERIFIABLE). This green is not evidence
pre-commit run --from-ref origin/main --to-ref HEAD	all content hooks pass. Three script hooks (waive list check, validate-test-lists, pinned memory policy) fail locally with TypeError: unsupported operand type(s) for | — the hook interpreter here predates PEP 604, not a finding; all three pass when run under python3.12
defs/.test_durations	JSON re-validated, 1603 entries
pre-commit (codespell, ruff, ruff-format, legacy lint, vendored-sync)	Passed

PR Checklist

• Commit message follows the required format and is DCO signed off
• No unit tests for the perf harness; all perf-sanity-related unit test changes reverted, and the pre-existing harness test the revert tripped over deleted
• The one shipped tensorrt_llm/serve/ behaviour change is covered by two unit tests, registered on l0_cpu by node id so they actually run
• Root cause identified and fixed at its source, not worked around
• Coverage lost by the above stated explicitly rather than left implicit

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Walkthrough

The PR adds optional time_breakdown test IDs, lifecycle timestamp propagation, in-memory timing aggregation, perf-sanity metric upload, new timing test cases, and related CI configuration updates.

Changes

Time-breakdown performance flow

Layer / File(s)	Summary
Test-ID parsing and launch wiring jenkins/scripts/perf/..., tests/integration/defs/perf/test_perf_sanity.py	Test-ID parsing, CLI handling, validation, benchmark-mode labels, and launch configuration now support the optional time_breakdown modifier.
Lifecycle timestamps and statistics outputs tensorrt_llm/serve/perf_metrics.py, tensorrt_llm/serve/scripts/...	Server and KV-cache timestamps propagate through metrics records. Timing records are parsed in memory and exported as span statistics.
Time-breakdown metric aggregation tests/integration/defs/perf/time_breakdown_metrics.py	Worker records are classified, warmups can be removed, clock offsets are corrected, spans are aggregated, files are settled, and harness metrics are formatted.
Perf-sanity instrumentation and upload tests/integration/defs/perf/test_perf_sanity.py, tests/integration/defs/perf/README_test_perf_sanity.md	Perf-sanity configures timing output, bounds client log windows, processes aggregated and disaggregated records, uploads metrics, and preserves mode-specific regression behavior.
CI lanes and validation support jenkins/L0_Test.groovy, tests/integration/test_lists/test-db/*, tests/unittest/tools/test_perf_sanity_matching.py	Timing cases and timeout entries were added. GB300 split counts and SLURM environment exports were updated. Obsolete matching tests and metadata were removed.

Priority: ➖ Normal

Estimated code review effort: 5 (Critical) | ~90 minutes

Sequence Diagram(s)

sequenceDiagram
  participant PerfSanity
  participant BenchmarkClient
  participant PerfMetricsJSONL
  participant TimeBreakdownMetrics
  participant ResultsDatabase
  PerfSanity->>BenchmarkClient: enable time-breakdown output
  BenchmarkClient->>PerfMetricsJSONL: write lifecycle records
  PerfSanity->>TimeBreakdownMetrics: wait for settled records
  TimeBreakdownMetrics->>TimeBreakdownMetrics: aggregate timing metrics
  TimeBreakdownMetrics->>ResultsDatabase: upload diagnostic metrics

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Merge Risk: 🟡 Moderate · up to 1a121

The timing instrumentation is not fully merge-ready because perf-sanity can still encounter an unhandled file race or unsupported generated IDs, while two tests do not reliably protect their intended validation behavior.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 74.87% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 199 functions across 16 files. (1 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title follows the required ticket/type format and clearly identifies the primary change: uploading per-request disaggregated lifecycle spans to OpenSearch.
Description check	✅ Passed	The description is comprehensive and explains the purpose, root cause, implementation, test coverage, verification results, known test limitations, and checklist status. It uses equivalent sections fo…

Full details: Docstring Coverage

Explanation

Docstring coverage is 74.87% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 199 functions across 16 files. (1 skipped: 1 unsupported.)

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Inline comments:
In `@jenkins/scripts/perf/local/submit.py`:
- Line 165: Update both the local --test-list parser and the CI parser around
split_modifiers to apply the same validation as the local --config-file path,
rejecting gen_only-time_breakdown IDs before job allocation. Replace the
existing accepted-fixture coverage with tests confirming both parsers reject
this ID.

In `@tensorrt_llm/serve/scripts/benchmark_serving.py`:
- Around line 1138-1139: Add focused regression coverage for
benchmark_serving.main’s artifact error paths: simulate OSError while writing
JSONL and statistics JSON, verify Time Breakdown is still emitted and subsequent
artifact operations continue, and simulate a diagram ValueError to confirm it is
handled without propagating.

In `@tests/integration/defs/perf/time_breakdown_metrics.py`:
- Line 684: Update discover_perf_metrics_files around the os.path.getsize check
to catch OSError from files removed or renamed after discovery, treat those
paths as empty, and skip them so polling continues with the existing warning
behavior.

In `@tests/unittest/scripts/test_perf_sanity_helpers.py`:
- Around line 654-656: Update the malformed UTF-8 test fixture around
_scan_gen_worker_device_step_time so the truncated sequence appears on a line
that includes prev_device_step_time, ensuring the worker reaches
raw_line.decode(errors="replace"). Keep the malformed bytes mid-file and
preserve the existing test intent of validating replacement decoding.

In `@tests/unittest/scripts/test_perf_submit.py`:
- Line 660: Update the pytest.raises expectation in the affected parser test to
require ValueError only, removing AssertionError from the accepted exceptions so
the test catches regressions when assert-based validation is optimized out.

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• jenkins/L0_Test.groovy
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• jenkins/scripts/perf/local/README.md
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• jenkins/scripts/perf/local/submit.py
• jenkins/scripts/perf/submit.py
• tensorrt_llm/serve/perf_metrics.py
• tensorrt_llm/serve/scripts/benchmark_serving.py
• tensorrt_llm/serve/scripts/time_breakdown/time_breakdown.py
• tests/integration/defs/perf/README_test_perf_sanity.md
• tests/integration/defs/perf/test_perf_sanity.py
• tests/integration/defs/perf/time_breakdown_metrics.py
• tests/integration/test_lists/test-db/l0_cpu.yml
• tests/integration/test_lists/test-db/l0_gb300_multi_gpus_perf_sanity.yml
• tests/integration/test_lists/test-db/l0_gb300_multi_nodes_perf_sanity_ctx12_node1_gpu4_gen1_node2_gpu8.yml
• tests/integration/test_lists/test-db/l0_gb300_multi_nodes_perf_sanity_ctx1_node1_gpu4_gen4_node2_gpu8.yml
• tests/integration/test_lists/test-db/l0_gb300_multi_nodes_perf_sanity_ctx3_node1_gpu4_gen1_node8_gpu32.yml
• tests/integration/test_lists/test-db/l0_gb300_multi_nodes_perf_sanity_ctx6_node1_gpu4_gen1_node4_gpu16.yml
• tests/scripts/perf-sanity/cache_transceiver_precheck/run_precheck.py
• tests/unittest/llmapi/apps/test_request_metrics.py
• tests/unittest/others/test_cache_transceiver_precheck_config.py
• tests/unittest/others/test_perf_sanity_time_breakdown.py
• tests/unittest/others/test_time_breakdown.py
• tests/unittest/others/test_time_breakdown_metrics.py
• tests/unittest/scripts/test_perf_sanity_helpers.py
• tests/unittest/scripts/test_perf_submit.py
• tests/unittest/tools/test_perf_sanity_matching.py

Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review.

[ZhanruiSunCh]

LGTM for infra part

[chenfeiz0326]

Thanks @coderabbitai — went through all five. Two are real and are fixed in 4dfa175; three are not acted on, with reasons.

Fixed

1. gen_only + time_breakdown accepted (local/submit.py, and the same hole in jenkins/scripts/perf/submit.py) — agreed, and this is the worst-shaped bug in the PR. get_disagg_test_cases mints the modifier for exactly two modes; grep "time_breakdown=True" returns two call sites, "e2e" and "ctx_only". disagg_upload-gen_only-time_breakdown-<stem> is grammatically valid, so both id-composing entry points accepted it: the job queues, builds, allocates a multi-node GB300 reservation, then pytest exits no tests ran and every gate reports green. The --config-file path already refused it and my own comment there names that exact consequence — so the check existed, it was just applied at one of three entry points. Now applied in both parsers against the same TIME_BREAKDOWN_BENCHMARK_MODES allowlist.

3. Unguarded os.path.getsize in discover_perf_metrics_files — agreed. snapshot() four lines below, in the same poll iteration, already wraps the identical syscall in try/except OSError, and the gate's docstring says expiry is "a warning rather than an error", so an exception escaping it is the wrong shape. Guarded identically.

Both verified with a differential probe against the pre-fix commit rather than by inspection, since this PR ships no unit tests:

probe	1a121db551	4dfa175e59
four minted ids (e2e+mod, gen_only, ctx_only+mod, ctx_only), both parsers	ACCEPT	ACCEPT
disagg_upload-gen_only-time_breakdown-<stem>, both parsers	ACCEPT	ValueError in both
discover_perf_metrics_files on one good file + one empty file + one dangling symlink the glob matches	FileNotFoundError	good file returned, other two dropped

The four positive-control rows are the negative control for the fix: had it over-reached, they would have flipped too. main's restored perf suites still pass (156).

Not acted on

2. benchmark_serving.py:1139 artifact writes — the description of the code is accurate, but the code is already correct: each artifact write has its own try/except OSError, and the Time Breakdown ... summary lines are printed before any file write, so a failed write cannot swallow the numbers. This reads as a coverage request rather than a defect. Stating the uncomfortable half plainly: this is shipped tensorrt_llm/serve/ code, so the "a perf script isn't worth a unit-test suite" reasoning behind this PR having no tests genuinely does not cover it.

4 and 5 (test_perf_sanity_helpers.py:656, test_perf_submit.py:660) — moot: the review ran against 3ccaf1fee0, and both files are now reverted to main (all perf-sanity-related unit test changes are out of this PR). Both points are right on the merits and worth recording for whoever touches those files next: #5, pytest.raises((AssertionError, ValueError)) is strictly weaker than ValueError because assert vanishes under python -O; #4, that test passes even with errors="replace" deleted.

🤖 Generated with Claude Code

[coderabbitai]

Tip

For best results, initiate chat on the files or code changes.

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
set -euo pipefail

echo '== Final commit presence =='
git show --no-patch --format='%H%n%s' 4dfa175e59

echo '== Modified relevant files versus PR base =='
base_ref="$(git merge-base HEAD origin/main 2>/dev/null || git merge-base HEAD main)"
git diff --name-status "$base_ref"...HEAD -- \
  jenkins/scripts/perf/local/submit.py \
  jenkins/scripts/perf/submit.py \
  tensorrt_llm/serve/scripts/benchmark_serving.py \
  tests/integration/defs/perf/time_breakdown_metrics.py \
  tests/unittest/tools/test_perf_sanity_helpers.py \
  tests/unittest/tools/test_perf_submit.py

echo '== Parser and file-discovery implementations =='
ast-grep outline jenkins/scripts/perf/local/submit.py --items all --type function --match 'parse_test_string|format_test_label'
ast-grep outline jenkins/scripts/perf/submit.py --items all --type function --match 'parse_test_case_name'
ast-grep outline tests/integration/defs/perf/time_breakdown_metrics.py --items all --type function --match 'discover_perf_metrics_files'
rg -n -A35 -B8 'def (parse_test_string|parse_test_case_name|discover_perf_metrics_files)\b|TIME_BREAKDOWN_BENCHMARK_MODES' \
  jenkins/scripts/perf/local/submit.py \
  jenkins/scripts/perf/submit.py \
  tests/integration/defs/perf/time_breakdown_metrics.py

echo '== Benchmark artifact write order and exception handling =='
rg -n -A80 -B15 'Time Breakdown|export_statistics_json|generate_html|write.*jsonl|jsonl' \
  tensorrt_llm/serve/scripts/benchmark_serving.py

Length of output: 40655

---

@chenfeiz0326 Confirmed.

The final code rejects gen_only-time_breakdown in both submit parsers. Both parsers use TIME_BREAKDOWN_BENCHMARK_MODES = ("e2e", "ctx_only").

discover_perf_metrics_files now catches OSError from os.path.getsize and skips the raced path.

I withdraw finding 2. benchmark_serving.py prints the Time Breakdown ... metrics before artifact generation. Each artifact write has independent error handling.

Findings 4 and 5 do not apply to the final PR diff because the affected test files are not changed.

Thank you for the differential validation details. 🐇

---

✏️ Learnings added

Learnt from: chenfeiz0326
URL: https://github.com/NVIDIA/TensorRT-LLM/pull/18990

Timestamp: 2026-09-11T02:25:06.724Z
Learning: In `tests/unittest/tools/test_perf_submit.py`, parser-rejection tests must require `ValueError` rather than accept `(AssertionError, ValueError)`. Python removes `assert` statements under `python -O`, so `AssertionError` is not a reliable validation contract.

---

Learnt from: chenfeiz0326
URL: https://github.com/NVIDIA/TensorRT-LLM/pull/18990

Timestamp: 2026-09-11T02:25:06.724Z
Learning: In `tests/unittest/tools/test_perf_sanity_helpers.py`, tests for malformed text decoding must verify the required `errors="replace"` behavior. A test that passes after removal of `errors="replace"` does not cover the intended decoding policy.

Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.

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[QiJune]

LGTM

[github-actions]

Automatically added "ci: full pre-merge approved" because this PR has satisfied the required GitHub review approvals. Unresolved review conversations and other required checks remain independent merge requirements.

[chenfeiz0326]

/bot run --disable-fail-fast

[QiJune]

Focused on the tensorrt_llm/serve/ part since that is shipped library code rather than perf-harness code. Three comments inline.

[tensorrt-cicd]

PR_Github #72839 [ run ] triggered by Bot. Commit: 4dfa175 Link to invocation

[chenfeiz0326]

@QiJune Thanks — all three are correct, and one of them is worse than you wrote. Applied in the latest commit.

A. compute_statistics docstring. You're right that the "negative durations are kept" paragraph is false: calculate_duration returns 0 when start_time > end_time, so an overlapped span is indistinguishable from an unmeasured one and both are dropped by the if duration > 0 filter.

It's stronger than that. The paragraph's own worked example — step_preprocessing under the overlap scheduler — cannot appear in this function's output at all: the client's TimingMetricsConfig has 12 spans and step_preprocessing is not one of them. So the justification cited a span the code never computes, for a clamp that discards the very case it claimed to preserve. Docstring rewritten to say the view is coarse and to point at tests/integration/defs/perf/time_breakdown_metrics.py for the signed, per-step and per-chunk aggregation. Behaviour unchanged.

B. Two producers of the same scraped lines. Agreed, and this was a real hole rather than just redundancy. benchmark_serving.py printed Time Breakdown <span> <stat> (ms): lines and so does the harness's append_time_breakdown_metrics; parse_metrics_from_output resolves duplicates by last-match-wins.

The consequence is a defeated gate. test_perf_sanity.py documents that aggregation failures are reported-and-skipped rather than raised because the resulting absence of Time Breakdown ... lines is what check_test_failure hard-fails on. But the client had already printed 12 spans × 4 stats = 48 such lines into the same stdout, so tb_* was never empty and that check could not fire. A failed aggregation would have silently downgraded the uploaded series from 27 spans to 12, with overlapped spans dropped — no gate would have noticed.

The print loop is deleted. compute_statistics is still written as an artifact for anyone who passes --save-request-time-breakdown by hand, and the harness is now the sole producer of the scraped lines. This also dissolves CodeRabbit's comment #2, which was about the duplicate-line resolution.

C2. The not x vs is None comment. Correct — the comment justified the falsy test with a claim about the aggregated path that doesn't hold, since _as_seconds already maps <= 0 to None. (Your line cite was L227 vs the actual L237; that's just drift from reviewing 3ccaf1f.) Trimmed to what is true: both producers already yield None, the falsy test is belt-and-braces, and a populated timestamp is a steady-clock reading so it is never 0. Behaviour unchanged.

C1. Tests. Splitting your point in two, per the maintainer's call on this branch:

• No unit tests for the perf-harness code. Agreed, and the perf-sanity test files stay deleted.
• The tensorrt_llm/serve/ fix does get tests. Added two to tests/unittest/llmapi/apps/test_request_metrics.py, covering both halves of the KV-transfer gate: a header-derived disagg record must keep kv_cache_transfer_start/_end even though it can never carry kv_cache_size (this is the bug — the old gate zeroed that span for every disaggregated request), and an unpopulated timestamp must stay absent rather than be written as 0.0.

On your point that the file never runs: confirmed, test_request_metrics.py appears on no test list, and l0_cpu.yml enumerates llmapi/apps per file. I registered the two new cases by node id rather than the file, so they actually run without also enabling the dozen pre-existing cases that have never run in CI — that's a separate change.

Verification. pytest can't run in this environment, so the two new tests were driven against three revisions of perf_metrics.py loaded side by side: this branch, origin/main, and this branch with only the old kv_cache_size-keyed gate restored. The keeps-kv-transfer test passes on this branch and fails on both controls — the gate-only control failing precisely on kv_cache_transfer_start DROPPED, which is the behaviour the test claims to pin. The absent-stays-absent test passes on all three, as a guard rather than a differential. The test-list entries were also checked with scripts/check_test_list.py --validate, including a deliberate typo to confirm the validator resolves function-level node ids in that file rather than passing vacuously.

[chenfeiz0326]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #72957 [ run ] triggered by Bot. Commit: fadd4f5 Link to invocation

[tensorrt-cicd]

PR_Github #72839 [ run ] completed with state ABORTED. Commit: 4dfa175

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[tensorrt-cicd]

PR_Github #72957 [ run ] completed with state SUCCESS. Commit: fadd4f5
/LLM/main/L0_MergeRequest_PR pipeline #59920 completed with status: 'FAILURE'

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[chenfeiz0326]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #73056 [ run ] triggered by Bot. Commit: fadd4f5 Link to invocation

[tensorrt-cicd]

PR_Github #73056 [ run ] completed with state SUCCESS. Commit: fadd4f5
/LLM/main/L0_MergeRequest_PR pipeline #60007 completed with status: 'SUCCESS'

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