[CI] Add E2E Blackwell Quantized MoE Test (#25723)

Signed-off-by: mgoin <mgoin64@gmail.com>

Author: mgoin

.buildkite/test-pipeline.yaml

@@ -522,7 +522,7 @@ steps:
   # https://github.com/pytorch/ao/issues/2919, we'll have to skip new torchao tests for now
   # we can only upgrade after this is resolved
   - pip install --pre torchao==0.13.0.dev20250814 --index-url https://download.pytorch.org/whl/nightly/cu128
-  - VLLM_TEST_FORCE_LOAD_FORMAT=auto pytest -v -s quantization
+  - VLLM_TEST_FORCE_LOAD_FORMAT=auto pytest -v -s quantization/
 
 - label: LM Eval Small Models # 53min
   timeout_in_minutes: 75
@@ -830,6 +830,23 @@ steps:
     - uv pip install --system 'gpt-oss[eval]==0.0.5'
     - pytest -s -v tests/evals/gpt_oss/test_gpqa_correctness.py --model openai/gpt-oss-20b --metric 0.58 --server-args '--tensor-parallel-size 2'
 
+- label: Blackwell Quantized MoE Test
+  timeout_in_minutes: 60
+  working_dir: "/vllm-workspace/"
+  gpu: b200
+  source_file_dependencies:
+  - tests/quantization/test_blackwell_moe.py
+  - vllm/model_executor/models/deepseek_v2.py
+  - vllm/model_executor/models/gpt_oss.py
+  - vllm/model_executor/models/llama4.py
+  - vllm/model_executor/layers/fused_moe
+  - vllm/model_executor/layers/quantization/compressed_tensors
+  - vllm/model_executor/layers/quantization/modelopt.py
+  - vllm/model_executor/layers/quantization/mxfp4.py
+  - vllm/v1/attention/backends/flashinfer.py
+  commands:
+    - pytest -s -v tests/quantization/test_blackwell_moe.py
+
 #####  1 GPU test  #####
 #####  multi gpus test  #####
 

tests/quantization/test_blackwell_moe.py

@@ -0,0 +1,132 @@
+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import json
+import os
+
+import pytest
+
+from tests.utils import RemoteOpenAIServer
+from vllm.platforms import current_platform
+
+if not current_platform.is_device_capability(100):
+    pytest.skip("This test only runs on Blackwell GPUs (SM100).",
+                allow_module_level=True)
+
+os.environ["FLASHINFER_NVCC_THREADS"] = "16"
+
+# dummy_hf_overrides = {"num_layers": 4, "num_hidden_layers": 4,
+# "text_config": {"num_layers": 4, "num_hidden_layers": 4}}
+dummy_hf_overrides = {"num_layers": 4, "num_hidden_layers": 4}
+
+
+def can_initialize(model: str, extra_args: list[str]):
+
+    # Server arguments
+    server_args = [
+        "--max-model-len",
+        "2048",
+        "--max-num-batched-tokens",
+        "256",
+        "--load-format",
+        "dummy",
+        "--trust-remote-code",
+        "--limit-mm-per-prompt",
+        json.dumps({"image": 0}),
+        *extra_args,
+    ]
+
+    # Launch server and make a simple request
+    with RemoteOpenAIServer(
+            model,
+            server_args,
+            max_wait_seconds=1000,  # Due to FlashInfer compile
+            override_hf_configs=dummy_hf_overrides) as server:
+        client = server.get_client()
+        # Make a simple request to verify the server works
+        completion = client.completions.create(
+            model=model,
+            prompt=["Hello, World!"],
+            temperature=0,
+            max_tokens=2,
+        )
+        print(completion)
+        assert completion.choices[0].text is not None
+
+
+## Llama4 ##
+
+
+@pytest.mark.skip(reason=(
+    "RuntimeError: run_moe() Expected a value of type "
+    "'Optional[List[Tensor]]' for argument '_9' but instead found type "
+    "'list'."))
+def test_llama4_fp8_tensor_moe_flashinfer_cutlass(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP8", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "throughput")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP8", [])
+
+
+@pytest.mark.skip(reason="Works, but takes too long to run")
+def test_llama4_fp8_tensor_moe_flashinfer_trtllm(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP8", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "latency")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP8", [])
+
+
+@pytest.mark.skip(reason="Works, but takes too long to run")
+def test_llama4_nvfp4_moe_flashinfer_cutlass(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "throughput")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP4", [])
+
+
+@pytest.mark.skip(reason="RuntimeError: No kernel found for the given options")
+def test_llama4_nvfp4_moe_flashinfer_trtllm(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "latency")
+    can_initialize("nvidia/Llama-4-Scout-17B-16E-Instruct-FP4", [])
+
+
+## DeepSeekV3 ##
+
+
+def test_deepseek_fp8_block_moe_deep_gemm(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_DEEP_GEMM", "1")
+    can_initialize("deepseek-ai/DeepSeek-V3.1", [])
+
+
+def test_deepseek_nvfp4_moe_flashinfer_cutlass(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "throughput")
+    can_initialize("nvidia/DeepSeek-R1-0528-FP4-v2", [])
+
+
+@pytest.mark.skip(reason="RuntimeError: No kernel found for the given options")
+def test_deepseek_nvfp4_moe_flashinfer_trtllm(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_FP4", "1")
+    monkeypatch.setenv("VLLM_FLASHINFER_MOE_BACKEND", "latency")
+    can_initialize("nvidia/DeepSeek-R1-0528-FP4-v2", [])
+
+
+## GPT-OSS ##
+
+
+def test_gptoss_mxfp4bf16_moe_flashinfer(monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_MXFP4_BF16", "1")
+    can_initialize("openai/gpt-oss-20b", [])
+
+
+def test_gptoss_mxfp4mxfp8_moe_flashinfer_cutlass(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_MXFP4_MXFP8_CUTLASS", "1")
+    can_initialize("openai/gpt-oss-20b", [])
+
+
+def test_gptoss_mxfp4mxfp8_moe_flashinfer_trtllm(
+        monkeypatch: pytest.MonkeyPatch):
+    monkeypatch.setenv("VLLM_USE_FLASHINFER_MOE_MXFP4_MXFP8", "1")
+    can_initialize("openai/gpt-oss-20b", [])

tests/utils.py

@@ -91,8 +91,10 @@ def _start_server(self, model: str, vllm_serve_args: list[str],
         env['VLLM_WORKER_MULTIPROC_METHOD'] = 'spawn'
         if env_dict is not None:
             env.update(env_dict)
+        serve_cmd = ["vllm", "serve", model, *vllm_serve_args]
+        print(f"Launching RemoteOpenAIServer with: {' '.join(serve_cmd)}")
         self.proc: subprocess.Popen = subprocess.Popen(
-            ["vllm", "serve", model, *vllm_serve_args],
+            serve_cmd,
             env=env,
             stdout=sys.stdout,
             stderr=sys.stderr,

vllm/model_executor/layers/fused_moe/flashinfer_trtllm_moe.py

@@ -40,6 +40,8 @@ def flashinfer_fused_moe_blockscale_fp8(
     assert global_num_experts % 4 == 0
     assert top_k < (topk_group * global_num_experts / num_expert_group)
     assert block_shape == [128, 128]
+    # Routing kernel expects #experts <= #threads 256
+    assert global_num_experts <= 256
 
     a_q, a_sf = per_token_group_quant_fp8(x, block_shape[1])
     # NOTE: scales of hidden states have to be transposed!