[Config] Remove Unused Environment Variable `VLLM_DISABLE_PAD_FOR_CUDAGRAPH` (#26743)

Signed-off-by: yewentao256 <zhyanwentao@126.com>

vllm/envs.py

@@ -198,7 +198,6 @@ if TYPE_CHECKING:
     VLLM_USE_FLASHINFER_MOE_MXFP4_MXFP8_CUTLASS: bool = False
     VLLM_ALLREDUCE_USE_SYMM_MEM: bool = True
     VLLM_TUNED_CONFIG_FOLDER: str | None = None
-    VLLM_DISABLE_PAD_FOR_CUDAGRAPH: bool = False
     VLLM_GPT_OSS_HARMONY_SYSTEM_INSTRUCTIONS: bool = False
     VLLM_CUSTOM_SCOPES_FOR_PROFILING: bool = False
     VLLM_NVTX_SCOPES_FOR_PROFILING: bool = False
@@ -1304,12 +1303,6 @@ environment_variables: dict[str, Callable[[], Any]] = {
     "VLLM_ENABLE_CUDAGRAPH_GC": lambda: bool(
         int(os.getenv("VLLM_ENABLE_CUDAGRAPH_GC", "0"))
     ),
-    # Disable padding to CUDA graph capture batch sizes.
-    # TODO(wentao): https://github.com/vllm-project/vllm/issues/23378
-    # After the issue is fixed, we can remove this flag.
-    "VLLM_DISABLE_PAD_FOR_CUDAGRAPH": lambda: bool(
-        int(os.getenv("VLLM_DISABLE_PAD_FOR_CUDAGRAPH", "0"))
-    ),
     # Used to force set up loopback IP
     "VLLM_LOOPBACK_IP": lambda: os.getenv("VLLM_LOOPBACK_IP", ""),
     # Used to set the process name prefix for vLLM processes.

vllm/v1/worker/gpu_model_runner.py

@@ -2067,7 +2067,6 @@ class GPUModelRunner(LoRAModelRunnerMixin, KVConnectorModelRunnerMixin):
     def _get_num_input_tokens(self, num_scheduled_tokens: int) -> int:
         if (
             self.compilation_config.cudagraph_mode != CUDAGraphMode.NONE
-            and not envs.VLLM_DISABLE_PAD_FOR_CUDAGRAPH
             and hasattr(self, "cudagraph_batch_sizes")
             and self.cudagraph_batch_sizes
             and num_scheduled_tokens <= self.cudagraph_batch_sizes[-1]