[torch.compile] Cleanup compilation tests and custom passes, add debug utils,...

[torch.compile] Cleanup compilation tests and custom passes, add debug utils, fix DCE bug (#23091), fix test (#24376), and prep for custom op matching (#24604) (#24542)
Signed-off-by: Luka Govedič <lgovedic@redhat.com>
Signed-off-by: luka <lgovedic@redhat.com>
Signed-off-by: Luka Govedič <ProExpertProg@users.noreply.github.com>

vllm/config/__init__.py

@@ -905,10 +905,9 @@ def set_current_vllm_config(vllm_config: VllmConfig,
     except Exception:
         raise
     else:
-        logger.debug("enabled custom ops: %s",
-                     vllm_config.compilation_config.enabled_custom_ops)
-        logger.debug("disabled custom ops: %s",
-                     vllm_config.compilation_config.disabled_custom_ops)
+        if check_compile:
+            vllm_config.compilation_config.custom_op_log_check()
+
         if check_compile and \
             vllm_config.compilation_config.level == CompilationLevel.PIECEWISE \
             and compilation_counter.num_models_seen == num_models_seen:

vllm/config/compilation.py

@@ -487,6 +487,12 @@ class CompilationConfig:
                              "supported with torch>=2.9.0.dev. Set "
                              "use_inductor_graph_partition=False instead.")
 
+        for op in self.custom_ops:
+            if op[0] not in {'+', '-'} and op not in {'all', 'none'}:
+                raise ValueError(f"Invalid syntax '{op}' for custom op, "
+                                 "must be 'all', 'none', '+op' or '-op' "
+                                 "(where 'op' is the registered op name)")
+
     def init_backend(self, vllm_config: "VllmConfig") -> Union[str, Callable]:
         if self.level == CompilationLevel.NO_COMPILATION:
             raise ValueError("No compilation level is set.")
@@ -628,3 +634,41 @@ class CompilationConfig:
 
         return use_fx_graph_piecewise_compilation or \
             use_inductor_piecewise_compilation
+
+    def custom_op_log_check(self):
+        """
+        This method logs the enabled/disabled custom ops and checks that the
+        passed custom_ops field only contains relevant ops.
+        It is called at the end of set_current_vllm_config,
+        after the custom ops have been instantiated.
+        """
+
+        if len(self.enabled_custom_ops) + len(self.disabled_custom_ops) == 0:
+            logger.debug("No custom ops found in model.")
+            return
+
+        logger.debug("enabled custom ops: %s", self.enabled_custom_ops)
+        logger.debug("disabled custom ops: %s", self.disabled_custom_ops)
+
+        all_ops_in_model = (self.enabled_custom_ops | self.disabled_custom_ops)
+        for op in self.custom_ops:
+            if op in {"all", "none"}:
+                continue
+
+            assert op[0] in {'+', '-'}, "Invalid custom op syntax " \
+                                        "(should be checked during init)"
+
+            # check if op name exists in model
+            op_name = op[1:]
+            if op_name not in all_ops_in_model:
+                from vllm.model_executor.custom_op import CustomOp
+
+                # Does op exist at all or is it just not present in this model?
+                # Note: Only imported op classes appear in the registry.
+                missing_str = "doesn't exist (or wasn't imported/registered)" \
+                    if op_name not in CustomOp.op_registry \
+                    else "not present in model"
+
+                enable_str = "enabling" if op[0] == '+' else "disabling"
+                logger.warning_once("Op '%s' %s, %s with '%s' has no effect",
+                                    op_name, missing_str, enable_str, op)

vllm/envs.py

@@ -190,6 +190,7 @@ if TYPE_CHECKING:
     VLLM_CUSTOM_SCOPES_FOR_PROFILING: bool = False
     VLLM_KV_EVENTS_USE_INT_BLOCK_HASHES: bool = True
     VLLM_OBJECT_STORAGE_SHM_BUFFER_NAME: str = "VLLM_OBJECT_STORAGE_SHM_BUFFER"
+    VLLM_PATTERN_MATCH_DEBUG: Optional[str] = None
 
 
 def get_default_cache_root():
@@ -442,6 +443,11 @@ environment_variables: dict[str, Callable[[], Any]] = {
     "VLLM_USE_STANDALONE_COMPILE":
     lambda: os.environ.get("VLLM_USE_STANDALONE_COMPILE", "0") == "1",
 
+    # Debug pattern matching inside custom passes.
+    # Should be set to the fx.Node name (e.g. 'getitem_34' or 'scaled_mm_3').
+    "VLLM_PATTERN_MATCH_DEBUG":
+    lambda: os.environ.get("VLLM_PATTERN_MATCH_DEBUG", None),
+
     # local rank of the process in the distributed setting, used to determine
     # the GPU device id
     "LOCAL_RANK":

vllm/utils/__init__.py

@@ -3413,3 +3413,16 @@ def length_from_prompt_token_ids_or_embeds(
                 f" prompt_token_ids={prompt_token_len}"
                 f" prompt_embeds={prompt_embeds_len}")
         return prompt_token_len
+
+
+@contextlib.contextmanager
+def set_env_var(key, value):
+    old = os.environ.get(key)
+    os.environ[key] = value
+    try:
+        yield
+    finally:
+        if old is None:
+            del os.environ[key]
+        else:
+            os.environ[key] = old