added levels default

Signed-off-by: morrison-turnansky <mturnans@redhat.com>

Author: morrison-turnansky

vllm/config/compilation.py

@@ -11,6 +11,7 @@
 from pydantic import TypeAdapter, field_validator
 from pydantic.dataclasses import dataclass
 
+import vllm.envs as envs
 from vllm.compilation.inductor_pass import CallableInductorPass, InductorPass
 from vllm.config.utils import config
 from vllm.logger import init_logger
@@ -532,6 +533,15 @@ def __post_init__(self) -> None:
         if self.backend == "":
             self.backend = "inductor"
 
+        # Come back to!
+        if self.level is None:
+            if envs.VLLM_USE_V1:
+                self.level = CompilationLevel.PIECEWISE
+            else:
+                # NB: Passing both --enforce-eager and a compilation level
+                # in V0 means the compilation level wins out.
+                self.level = CompilationLevel.NO_COMPILATION
+
         if count_none + count_all == 0:
             if self.level > 0 and self.backend != "eager":
                 self.custom_ops.insert(0, "none")