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test(e2e): size the in-flight load burst to outlast the poll, and widen the gateway lane budget - #2476
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…en the gateway lane budget The burst check sent sixteen 512-token requests and expected a load poll to see them; on vLLM a 1B model finished the whole burst in about 1.3 s, inside one 2-second poll interval, and the check failed on every attempt while passing on the slower SGLang. The gateway now polls every second and the burst is thirty-two 1536-token requests, which outlasts several polls on any engine here. The regular class also drops its private model so it reuses the pooled worker the other router tests already run on, instead of restarting a worker for one class. The gateway lanes get 30 minutes: the router suite gained load-report, overload and restart classes, and the sglang lane was cancelled at the 20-minute job budget on the first PR that ran all of them. Signed-off-by: Alex McC <319643551+hello-alexmcc@users.noreply.github.com>
📝 SummarySummary by CodeRabbit
WalkthroughThe router load test now monitors more frequently, sends larger concurrent bursts, and allows longer joins. The 1-GPU gateway matrix gives SGLang and vLLM jobs 30-minute timeouts. ChangesRouter load timing
Priority: ⬇️ Low Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🟡 Moderate · up to The expanded load test can substantially overrun its CI budget when requests stall and may miss late request failures. Cleanup should use one bounded deadline before merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 2 functions across 1 files. (1 skipped: 1 unsupported.)
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| # sixteen 512-token generations in about a second, inside a single wider poll. | ||
| LOAD_MONITOR_INTERVAL_SECS = 1 | ||
| _GATEWAY_ARGS = ["--load-monitor-interval", str(LOAD_MONITOR_INTERVAL_SECS)] | ||
| _REPORT_TIMEOUT_SECS = 8 * LOAD_MONITOR_INTERVAL_SECS |
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🟡 Nit: Dropping the interval to 1 s also halves an unrelated budget: _REPORT_TIMEOUT_SECS is derived from it, so the presence check in _wait_for_reports goes from 16 s to 8 s of wall clock for all three tests — including test_prefill_and_decode_workers_report_load, where two PD workers have to land a first report. A de-flake PR shouldn't tighten the margin on the checks it isn't fixing; consider decoupling them (e.g. _REPORT_TIMEOUT_SECS = 16 or max(16, 8 * LOAD_MONITOR_INTERVAL_SECS)).
Also, the rationale comment just above now describes neither the model nor the burst this class uses — with the model marker gone the class runs the pooled 8B default, and the burst is 32×1536. Worth rewording so the "sixteen 512-token generations on a small model" reads as the historical failure rather than as what the test does.
| finally: | ||
| for t in threads: | ||
| t.join(timeout=120) | ||
| t.join(timeout=300) |
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🟡 Nit: The joins are sequential and each gets its own 300 s budget, so a wedged engine (all 32 requests stuck until the OpenAI client's own timeout) burns up to 32 × 300 s ≈ 2.7 h here. The job budget is 30 min, so the lane gets killed mid-join and you lose the assertion output entirely — the old 16 × 120 s had the same shape but this pushes it ~5× further. A single shared deadline keeps it bounded:
finally:
join_deadline = time.monotonic() + 300
for t in threads:
t.join(timeout=max(0.0, join_deadline - time.monotonic()))
stragglers = [t for t in threads if t.is_alive()]Related: a timed-out join is currently silent. Since this class now shares the pooled worker with the other default-model gRPC router classes (that's the point of dropping the model marker), leaked daemon threads would keep generating 1536 tokens each on the same worker that TestMMLUGrpc runs against next, showing up there as an unexplained slowdown. Worth asserting no thread is still alive after the join.
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Actionable comments posted: 2
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Inline comments:
In `@e2e_test/router/test_loads.py`:
- Around line 28-29: Update the burst-size comment near the load test to
describe the actual workload: 32 requests with max_tokens=1536, replacing the
outdated sixteen 512-token generation details.
- Line 138: Update the thread cleanup loop around t.join so all joins share one
absolute 300-second deadline instead of allowing 300 seconds per thread. After
the deadline, verify that no thread remains alive and fail the test if any do;
only assert errors after cleanup has completed so late request failures are
captured.
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Description
Problem
test_report_reflects_in_flight_requests(merged in #2460) sends sixteen 512-token requests and expects at least one load poll to show running or waiting work. On vLLM a 1B model on an H100 finishes that whole burst in about 1.3 s (run 34277963919: requests sent at 21:52:57.4, all answered by 21:52:58.7), inside a single 2-second poll interval, so the check fails on every attempt there while passing on the slower SGLang. That failure blocks every PR'se2e-1gpu-gateway (vllm)lane, and since the PD lanes depend on the gateway lane, it also skips them.Separately, the sglang gateway lane was cancelled at its 20-minute job budget on the same run: the router suite gained the load-report class (and #2462 adds overload and restart classes), and the load-report class used a different model than the other router tests, which made the worker pool restart a worker for it.
Solution
TestWorkerLoadReportsdrops its private model marker so it reuses the pooled worker the other router tests run on, instead of restarting a worker for one class. The PD class keeps the small model because PD workers are not pooled.e2e-1gpu-gatewaylanes get a 30-minute budget.Changes
e2e_test/router/test_loads.py: poll interval, burst size, thread join timeout, model marker..github/workflows/pr-test-rust.yml: gateway lane budget.Test Plan
ruff check/ruff format --checkandmypy --config-file mypy.iniclean.e2e-1gpu-gateway (sglang, vllm)lanes on this PR are the check; the vLLM one failed three attempts in a row before this change.Checklist
cargo +nightly fmtpasses (no Rust changes)cargo clippy --all-targets --all-features -- -D warningspasses (no Rust changes)