[Bugfix] skip cuda graph for drafter when running with eager (#26821)

Signed-off-by: Benjamin Chislett <bchislett@nvidia.com>

Author: benchislett

vllm/v1/worker/gpu_model_runner.py

@@ -3482,7 +3482,10 @@ def _dummy_run(
 
             if self.speculative_config and self.speculative_config.use_eagle():
                 assert isinstance(self.drafter, EagleProposer)
-                use_cudagraphs = cudagraph_runtime_mode == CUDAGraphMode.PIECEWISE
+                use_cudagraphs = (
+                    cudagraph_runtime_mode == CUDAGraphMode.PIECEWISE
+                    and not self.speculative_config.enforce_eager
+                )
                 self.drafter.dummy_run(num_tokens, use_cudagraphs=use_cudagraphs)
 
         # This is necessary to avoid blocking DP.