[https://nvbugs/6329155][fix] Raise glm5 tep8 8k1k max_num_tokens to 8192 to fit isl=8192 prefill - #18006
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Included review availability: Your plan provides up to 12 included reviews per hour; 11 remain after this review. WalkthroughThe GLM5 FP4 Blackwell performance sanity configuration increases ChangesGLM5 FP4 performance configuration
Estimated code review effort: 1 (Trivial) | ~2 minutes Merge Risk: 🔵 Low · up to The PR makes a localized configuration correction and restores CI coverage, with the target workload validated successfully. It is mergeable with owner awareness or follow-up to add the required NVIDIA copyright header to the modified YAML file. Possibly related PRs
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In `@tests/scripts/perf-sanity/aggregated/glm5_fp4_blackwell.yaml`:
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LGTM. Did we check other agg configs for max_num_tokens?
…8192 to fit isl=8192 prefill The perf-sanity aggregated case test_e2e[aggr_upload-glm5_fp4_blackwell-glm5_fp4_tep8_mtp3_8k1k] could never serve a single request. Its server_config declared max_num_tokens: 256 while its only client_config (con2_iter10_8k1k) sends isl=8192, and enable_chunked_prefill is absent (defaults to False), so the whole 8192-token prompt has to fit in one token budget. The OpenAI server rejects any request whose prompt+query length exceeds max_num_tokens, so every request was refused at the API layer before reaching the scheduler: tensorrt_llm.executor.utils.RequestError: The sum of prompt length (8192.0), query length (0) should not exceed max_num_tokens (256) No request was ever served, so the benchmark produced no accounting and the case failed deterministically. Raising the budget to 8192 makes it exactly sufficient for isl=8192 (the check is a strict >). That 8192 is feasible on this node is established two ways: the in-file sibling server_config glm5_fp4_dep8_mtp1_8k1k already runs the same isl=8192/osl=1024 workload with a larger max_num_tokens: 12288, and glm5_fp4_2_nodes_grace_blackwell.yaml declares the same glm5_fp4_tep8_mtp3_8k1k server (same max_batch_size: 4, same client isl/osl) with max_num_tokens: 8192 and is not waived. Verified on B200/computelab (8x B200, node umbriel-b200-093) with the patched config: 20/20 requests successful, 0 failed, total_token_throughput 2226.89 tok/s, all ranks exit 0. Before the change the same case on the same commit produced the RequestError above and no accounting. This change also removes the case's SKIP line from tests/integration/test_lists/waives.txt. The waiver is what stops every pre-merge stage from exercising this config, so leaving it in place would land the fix with no CI coverage; the verified re-run above is what authorizes the unwaive. Only this case's line is removed. nvbugs/6329155, ToT re-check 20260819 (origin/main d0e8baa) Signed-off-by: chenfeiz0326 <203214996+chenfeiz0326@users.noreply.github.com>
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/bot skip --comment "Unwaive a perf test, No need to run the whole CI pipeline" |
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PR_Github #68271 [ skip ] triggered by Bot. Commit: |
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PR_Github #68271 [ skip ] completed with state |
3 participants
Root cause
The perf-sanity aggregated case
could never serve a single request at ToT. Its
server_configdeclaredmax_num_tokens: 256, while its onlyclient_config(con2_iter10_8k1k) sendsisl: 8192.enable_chunked_prefillis absent from that server_config (so itdefaults to
False), which means the entire 8192-token prompt has to fit in onetoken budget. The OpenAI server rejects any request whose prompt + query length
exceeds
max_num_tokens, so every request was refused at the API layer, beforereaching the scheduler:
No request was ever served, so the benchmark produced no request accounting and
the case failed deterministically — it is a case-config defect, not a
model/runtime bug and not flakiness.
Fix
One line: raise that server_config's budget to
8192, exactly sufficient forisl=8192(the server's check is a strict>).enable_chunked_prefillis deliberately left at its default — the point is tomake the declared workload runnable, not to change how it is scheduled.
Why 8192 is feasible on this node
Two independent existing configs establish the headroom, so this is not a guess:
glm5_fp4_dep8_mtp1_8k1kruns the sameisl=8192 / osl=1024workload on the same hardware with a largermax_num_tokens: 12288. A feasible 12288 budget means 8192 cannot OOM.tests/scripts/perf-sanity/aggregated/glm5_fp4_2_nodes_grace_blackwell.yamldeclares the same
glm5_fp4_tep8_mtp3_8k1kserver name with the samemax_batch_size: 4and the same clientisl/osl, but withmax_num_tokens: 8192— and it is not waived, i.e. it runs green.The only field that differs between this waived case and an already-green
config of the same server is
max_num_tokens(256 vs 8192).Before / after evidence
Both runs used commit
3253b640, 8x B200 on computelab, the same wheel(reused via
--wheel-dir, no rebuild —max_num_tokensis a runtimeserver-config value read from the YAML at server startup, not compiled in).
max_num_tokens: 256)max_num_tokens: 8192)umbriel-b200-028)umbriel-b200-093),COMPLETED 0:0RequestErrorabovenum_prompts=20, 20 successful, 0 failedtotal_token_throughput = 2226.89tok/sexit code 0, "Aggregated test completed successfully"Re-checked against current
origin/main(d0e8baa03b): the config still readsmax_num_tokens: 256, so the fix is still needed.Scope
config-max-num-tokens-256-lt-isl8192(1 case)tests/scripts/perf-sanity/aggregated/glm5_fp4_blackwell.yaml(the fix, 1 line) and
tests/integration/test_lists/waives.txt(the unwaive,1 line removed)
This PR also removes the case's waive line from
tests/integration/test_lists/waives.txt, so the fixed case returns topre-merge CI in the same change that fixes it. The waiver is what stopped every
pre-merge stage from exercising this config, so landing the fix while it stayed
in place would ship with no CI coverage. Only this case's line is removed; the
sibling perf-sanity waivers are untouched.
Test Coverage
perf/test_perf_sanity.py::test_e2e[aggr_upload-glm5_fp4_blackwell-glm5_fp4_tep8_mtp3_8k1k],run manually on 8x B200 (job 3767060) with this change applied: 20/20 requests
successful, 0 failed, 2226.89 tok/s.
PR Checklist
git commit -s)pytest.skip, nodisabled optimizations, no workload reduction
Dev Engineer Review
max_num_tokensfrom256to8192forglm5_fp4_tep8_mtp3_8k1k.isl=8192requests when chunked prefill is disabled.glm5_fp4_blackwellentry fromtests/integration/test_lists/waives.txt.Verdict: Sufficient.
QA Engineer Review
tests/scripts/perf-sanity/aggregated/.glm5_fp4_blackwellwaiver entry fromtests/integration/test_lists/waives.txt.Verdict: Needs follow-up.