[Bugfix] Fix kernel benchmark (#33752)

Signed-off-by: Jee Jee Li <pandaleefree@gmail.com>

benchmarks/fused_kernels/layernorm_rms_benchmarks.py

@@ -13,6 +13,7 @@ from torch.utils.benchmark import Measurement as TMeasurement
 from tqdm import tqdm
 
 import vllm._custom_ops as ops
+from vllm.benchmarks.lib.utils import default_vllm_config
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.model_executor.layers.quantization.utils.fp8_utils import (
     per_token_group_quant_fp8,
@@ -291,6 +292,7 @@ def print_timers(timers: Iterable[TMeasurement]):
     compare.print()
 
 
+@default_vllm_config()
 def main():
     torch.set_default_device("cuda")
     bench_params = get_bench_params()

benchmarks/kernels/benchmark_activation.py

@@ -7,6 +7,7 @@ import itertools
 import torch
 
 import vllm.model_executor.layers.activation  # noqa F401
+from vllm.benchmarks.lib.utils import default_vllm_config
 from vllm.model_executor.custom_op import op_registry
 from vllm.triton_utils import triton
 from vllm.utils.argparse_utils import FlexibleArgumentParser
@@ -18,6 +19,7 @@ intermediate_size = [3072, 9728, 12288]
 configs = list(itertools.product(batch_size_range, seq_len_range, intermediate_size))
 
 
+@default_vllm_config()
 def benchmark_activation(
     batch_size: int,
     seq_len: int,

benchmarks/kernels/benchmark_block_fp8_gemm.py

@@ -8,6 +8,7 @@ os.environ["VLLM_USE_DEEP_GEMM"] = "0"
 
 import torch
 
+from vllm.benchmarks.lib.utils import default_vllm_config
 from vllm.model_executor.layers.quantization.utils.fp8_utils import (
     W8A8BlockFp8LinearOp,
 )
@@ -40,6 +41,7 @@ DEEPSEEK_V3_SHAPES = [
 ]
 
 
+@default_vllm_config()
 def build_w8a8_block_fp8_runner(M, N, K, block_size, device, use_cutlass):
     """Build runner function for w8a8 block fp8 matmul."""
     factor_for_scale = 1e-2

benchmarks/kernels/benchmark_layernorm.py

@@ -5,12 +5,14 @@ import time
 
 import torch
 
+from vllm.benchmarks.lib.utils import default_vllm_config
 from vllm.model_executor.layers.layernorm import RMSNorm
 from vllm.utils.argparse_utils import FlexibleArgumentParser
 from vllm.utils.torch_utils import STR_DTYPE_TO_TORCH_DTYPE, set_random_seed
 
 
 @torch.inference_mode()
+@default_vllm_config()
 def main(
     num_tokens: int,
     hidden_size: int,

benchmarks/kernels/benchmark_mrope.py

@@ -36,6 +36,7 @@ from typing import Any
 import numpy as np
 import torch
 
+from vllm.benchmarks.lib.utils import default_vllm_config
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.transformers_utils.config import get_config
 from vllm.utils.argparse_utils import FlexibleArgumentParser
@@ -78,6 +79,7 @@ def calculate_stats(times: list[float]) -> dict[str, float]:
     }
 
 
+@default_vllm_config()
 def benchmark_mrope(
     model_name: str,
     num_tokens: int,

benchmarks/kernels/benchmark_per_token_quant_fp8.py

@@ -7,6 +7,7 @@ from unittest.mock import patch
 import pandas as pd
 import torch
 
+from vllm.benchmarks.lib.utils import default_vllm_config
 from vllm.model_executor.layers.quantization.input_quant_fp8 import QuantFP8
 from vllm.model_executor.layers.quantization.utils.quant_utils import GroupShape
 from vllm.triton_utils import triton
@@ -84,6 +85,7 @@ def calculate_diff(
 configs = []
 
 
+@default_vllm_config()
 def benchmark_quantization(
     batch_size,
     hidden_size,

benchmarks/kernels/benchmark_rope.py

@@ -5,6 +5,7 @@ import itertools
 
 import torch
 
+from vllm.benchmarks.lib.utils import default_vllm_config
 from vllm.model_executor.layers.rotary_embedding import get_rope
 from vllm.triton_utils import triton
 from vllm.utils.argparse_utils import FlexibleArgumentParser
@@ -29,6 +30,7 @@ def get_benchmark(head_size, rotary_dim, is_neox_style, device):
             args={},
         )
     )
+    @default_vllm_config()
     def benchmark(batch_size, seq_len, num_heads, provider):
         dtype = torch.bfloat16
         max_position = 8192

vllm/benchmarks/lib/utils.py

@@ -5,6 +5,7 @@ import argparse
 import json
 import math
 import os
+from contextlib import contextmanager
 from typing import Any
 
 
@@ -117,3 +118,14 @@ def write_to_json(filename: str, records: list) -> None:
             cls=InfEncoder,
             default=lambda o: f"<{type(o).__name__} is not JSON serializable>",
         )
+
+
+@contextmanager
+def default_vllm_config():
+    """Set a default VllmConfig for cases that directly test CustomOps or pathways
+    that use get_current_vllm_config() outside of a full engine context.
+    """
+    from vllm.config import VllmConfig, set_current_vllm_config
+
+    with set_current_vllm_config(VllmConfig()):
+        yield