AOT Compilation for torch.compile (Bundled) (#24274)

Signed-off-by: zhxchen17 <zhxchen17@fb.com>

.buildkite/test-pipeline.yaml

@@ -403,6 +403,7 @@ steps:
     - pytest -v -s compile/test_fusion_all_reduce.py
     - pytest -v -s compile/test_decorator.py
     - pytest -v -s compile/test_noop_elimination.py
+    - pytest -v -s compile/test_aot_compile.py
 
 - label: PyTorch Fullgraph Smoke Test # 15min
   timeout_in_minutes: 30

tests/compile/test_aot_compile.py

+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import tempfile
+from contextlib import contextmanager
+
+import pytest
+import torch
+
+from vllm.compilation.decorators import support_torch_compile
+from vllm.config import (
+    CompilationConfig,
+    CompilationLevel,
+    VllmConfig,
+    set_current_vllm_config,
+)
+from vllm.forward_context import set_forward_context
+from vllm.utils import is_torch_equal_or_newer
+
+
+def reference_fn(x: torch.Tensor):
+    assert x.shape[0] <= 42
+    assert x.shape[0] % 2 == 0
+    for _ in range(3000):
+        x = x + x.shape[0]
+    return x
+
+
+@support_torch_compile
+class CompiledMod(torch.nn.Module):
+    def __init__(self, **kwargs):
+        super().__init__()
+
+    def forward(self, x: torch.Tensor):
+        return reference_fn(x)
+
+
+def make_vllm_config() -> VllmConfig:
+    return VllmConfig(
+        compilation_config=CompilationConfig(
+            level=CompilationLevel.PIECEWISE,
+        )
+    )
+
+
+@contextmanager
+def use_vllm_config(vllm_config: VllmConfig):
+    with set_forward_context({}, vllm_config), set_current_vllm_config(vllm_config):
+        yield
+
+
+@pytest.mark.skipif(
+    not is_torch_equal_or_newer("2.10.0.dev"), reason="requires torch 2.10"
+)
+def test_no_dynamo_cache_entry(monkeypatch: pytest.MonkeyPatch):
+    with monkeypatch.context() as m:
+        vllm_config = make_vllm_config()
+        args = (torch.randn(10, 10),)
+        expected = reference_fn(*args)
+        with use_vllm_config(vllm_config):
+            m.setenv("VLLM_USE_AOT_COMPILE", "0")
+            with (
+                pytest.raises(RuntimeError, match="Detected recompile"),
+                torch.compiler.set_stance("fail_on_recompile"),
+            ):
+                CompiledMod(vllm_config=vllm_config)(*args)
+
+            m.setenv("VLLM_USE_AOT_COMPILE", "1")
+            torch._dynamo.reset()
+            with torch.compiler.set_stance("fail_on_recompile"):
+                actual = CompiledMod(vllm_config=vllm_config)(*args)
+            assert torch.allclose(actual, expected)
+
+
+@pytest.mark.skipif(
+    not is_torch_equal_or_newer("2.10.0.dev"), reason="requires torch 2.10"
+)
+def test_force_aot_load(monkeypatch: pytest.MonkeyPatch):
+    with tempfile.TemporaryDirectory() as tmpdirname, monkeypatch.context() as m:
+        args = (torch.randn(10, 10),)
+        m.setenv("VLLM_USE_AOT_COMPILE", "1")
+        m.setenv("VLLM_FORCE_AOT_LOAD", "1")
+        m.setenv("VLLM_CACHE_ROOT", tmpdirname)
+        vllm_config = make_vllm_config()
+        with use_vllm_config(vllm_config), pytest.raises(FileNotFoundError):
+            CompiledMod(vllm_config=vllm_config)(*args)
+
+
+@pytest.mark.skipif(
+    not is_torch_equal_or_newer("2.10.0.dev"), reason="requires torch 2.10"
+)
+def test_save_and_load(monkeypatch: pytest.MonkeyPatch):
+    with monkeypatch.context() as m:
+        args = (torch.randn(10, 10),)
+
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            m.setenv("VLLM_CACHE_ROOT", tmpdirname)
+            m.setenv("VLLM_USE_AOT_COMPILE", "1")
+            vllm_config = make_vllm_config()
+            with use_vllm_config(vllm_config):
+                expected = CompiledMod(vllm_config=vllm_config)(*args)
+
+            m.setenv("VLLM_FORCE_AOT_LOAD", "1")
+            vllm_config = make_vllm_config()
+            with use_vllm_config(vllm_config):
+                ret = CompiledMod(vllm_config=vllm_config)(*args)
+            assert torch.allclose(ret, expected)
+
+
+@pytest.mark.skipif(
+    not is_torch_equal_or_newer("2.10.0.dev"), reason="requires torch 2.10"
+)
+def test_shape_env(monkeypatch: pytest.MonkeyPatch):
+    """
+    Test that the shape environment is correctly serialized and preserved
+    when loading from cache.
+    """
+    with monkeypatch.context() as m:
+        args = (torch.randn(10, 10),)
+
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            m.setenv("VLLM_CACHE_ROOT", tmpdirname)
+            m.setenv("VLLM_USE_AOT_COMPILE", "1")
+            vllm_config = make_vllm_config()
+            with use_vllm_config(vllm_config):
+                compiled_mod = CompiledMod(vllm_config=vllm_config)
+                compiled_mod(*args)
+                artifacts = compiled_mod.aot_compiled_fn._artifacts
+                guards_string = artifacts.compiled_fn.shape_env.format_guards()
+                assert guards_string == " - s77 <= 42\n - Eq(Mod(s77, 2), 0)"
+
+            m.setenv("VLLM_FORCE_AOT_LOAD", "1")
+            vllm_config = make_vllm_config()
+            with use_vllm_config(vllm_config):
+                compiled_mod = CompiledMod(vllm_config=vllm_config)
+                compiled_mod(*args)
+                artifacts = compiled_mod.aot_compiled_fn._artifacts
+                guards_string = artifacts.compiled_fn.shape_env.format_guards()
+                assert guards_string == " - s77 <= 42\n - Eq(Mod(s77, 2), 0)"

tools/pre_commit/check_pickle_imports.py

@@ -22,6 +22,7 @@ ALLOWED_FILES = {
     "vllm/multimodal/hasher.py",
     "vllm/transformers_utils/config.py",
     "vllm/model_executor/models/registry.py",
+    "vllm/compilation/caching.py",
     "tests/utils_/test_utils.py",
     "tests/tokenization/test_cached_tokenizer.py",
     "vllm/distributed/utils.py",

vllm/compilation/backends.py

@@ -3,6 +3,7 @@
 
 import ast
 import dataclasses
+import hashlib
 import os
 import pprint
 import time
@@ -25,6 +26,7 @@ from vllm.logger import init_logger
 from vllm.platforms import current_platform
 from vllm.utils import is_torch_equal_or_newer, resolve_obj_by_qualname
 
+from .caching import VllmSerializableFunction
 from .compiler_interface import (
     CompilerInterface,
     EagerAdaptor,
@@ -195,6 +197,7 @@ class CompilerManager:
                 # there can be multiple graphs due to piecewise compilation.
                 now = time.time()
                 elapsed = now - compilation_start_time
+                compilation_config.compilation_time += elapsed
                 if runtime_shape is None:
                     logger.info(
                         "Directly load the compiled graph(s) for dynamic shape "
@@ -549,7 +552,11 @@ class VllmBackend:
                 self.post_grad_pass_manager.add(inductor_config[PASS_KEY])
         inductor_config[PASS_KEY] = self.post_grad_pass_manager
 
-    def __call__(self, graph: fx.GraphModule, example_inputs) -> Callable:
+    def __call__(
+        self, graph: fx.GraphModule, example_inputs
+    ) -> VllmSerializableFunction:
+        from .caching import _compute_code_hash, compilation_config_hash_factors
+
         vllm_config = self.vllm_config
         if not self.compilation_config.cache_dir:
             # no provided cache dir, generate one based on the known factors
@@ -557,39 +564,11 @@ class VllmBackend:
             # the cache dir will be the same so that we can reuse the compiled
             # graph.
 
-            factors = []
-            # 0. factors come from the env, for example, The values of
-            # VLLM_PP_LAYER_PARTITION will affect the computation graph.
-            env_hash = envs.compute_hash()
-            factors.append(env_hash)
-
-            # 1. factors come from the vllm_config (it mainly summarizes how the
-            #    model is created)
-            config_hash = vllm_config.compute_hash()
-            factors.append(config_hash)
-
+            factors = compilation_config_hash_factors(vllm_config)
             # 2. factors come from the code files that are traced by Dynamo (
             #    it mainly summarizes how the model is used in forward pass)
-            forward_code_files = list(sorted(self.compilation_config.traced_files))
+            code_hash = _compute_code_hash(self.compilation_config.traced_files)
             self.compilation_config.traced_files.clear()
-            logger.debug(
-                "Traced files (to be considered for compilation cache):\n%s",
-                "\n".join(forward_code_files),
-            )
-            hash_content = []
-            for filepath in forward_code_files:
-                hash_content.append(filepath)
-                if filepath == "<string>":
-                    # This means the function was dynamically generated, with
-                    # e.g. exec(). We can't actually check these.
-                    continue
-                with open(filepath) as f:
-                    hash_content.append(f.read())
-            import hashlib
-
-            code_hash = hashlib.md5(
-                "\n".join(hash_content).encode(), usedforsecurity=False
-            ).hexdigest()
             factors.append(code_hash)
 
             # 3. compiler hash
@@ -695,7 +674,9 @@ class VllmBackend:
             self.compilation_config.cudagraph_mode == CUDAGraphMode.NONE
             or not self.compilation_config.cudagraph_copy_inputs
         ):
-            return self.split_gm
+            return VllmSerializableFunction(
+                graph, example_inputs, self.prefix, self.split_gm
+            )
 
         # if we need to copy input buffers for cudagraph
         from torch._guards import detect_fake_mode
@@ -740,4 +721,6 @@ class VllmBackend:
                 list_args[index] = static_tensor
             return self.split_gm(*list_args)
 
-        return copy_and_call
+        return VllmSerializableFunction(
+            graph, example_inputs, self.prefix, copy_and_call
+        )

vllm/compilation/caching.py

+# SPDX-License-Identifier: Apache-2.0
+# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
+
+import hashlib
+import inspect
+import pickle
+from unittest.mock import patch
+
+import torch
+from torch.utils import _pytree as pytree
+
+import vllm.envs as envs
+from vllm.config import VllmConfig, get_current_vllm_config
+from vllm.logger import init_logger
+
+try:
+    from torch._dynamo.aot_compile import SerializableCallable
+except ImportError:
+    SerializableCallable = object
+
+assert isinstance(SerializableCallable, type)
+
+logger = init_logger(__name__)
+
+
+class VllmSerializableFunction(SerializableCallable):
+    """
+    A wrapper around a compiled function by vllm. It will forward the tensor
+    inputs to the compiled function and return the result.
+    It also implements a serialization interface to support PyTorch's precompile
+    with custom backend, so that we can save and load the compiled function on
+    disk. There's no need to wrap around the compiled function if we don't want
+    to serialize them in particular cases.
+    Right now serialization for the custom backend is done via
+    serializing the Dynamo fx graph plus example inputs.
+    """
+
+    def __init__(self, graph_module, example_inputs, prefix, optimized_call):
+        assert isinstance(graph_module, torch.fx.GraphModule)
+        self.graph_module = graph_module
+        self.example_inputs = example_inputs
+        self.prefix = prefix
+        self.optimized_call = optimized_call
+        self.shape_env = None
+        sym_input = next(
+            (i for i in self.example_inputs if isinstance(i, torch.SymInt)), None
+        )
+        if sym_input is not None:
+            self.shape_env = sym_input.node.shape_env
+
+    def __call__(self, *args, **kwargs):
+        return self.optimized_call(*args, **kwargs)
+
+    @classmethod
+    def serialize_compile_artifacts(
+        cls, compiled_fn: "VllmSerializableFunction"
+    ) -> bytes:
+        import sympy
+        from torch._subclasses import FakeTensorMode
+        from torch.fx._graph_pickler import GraphPickler, Options
+
+        state = compiled_fn.__dict__.copy()
+        state.pop("optimized_call")
+        state.pop("shape_env")
+        for node in state["graph_module"].graph.nodes:
+            node.meta.pop("source_fn_stack", None)
+            node.meta.pop("nn_module_stack", None)
+
+        graph_reducer_override = GraphPickler.reducer_override
+
+        def _graph_reducer_override(self, obj):
+            if (
+                inspect.isclass(obj)
+                and issubclass(obj, sympy.Function)
+                and hasattr(obj, "_torch_unpickler")
+            ):
+                return obj._torch_unpickler, (obj._torch_handler_name,)
+            if isinstance(obj, FakeTensorMode):
+                return type(None), ()
+            return graph_reducer_override(self, obj)
+
+        # Mask off tensor inputs since they are large and not needed.
+        state["example_inputs"] = pytree.tree_map_only(
+            torch.Tensor, lambda _: None, state["example_inputs"]
+        )
+        with patch.object(GraphPickler, "reducer_override", _graph_reducer_override):
+            state["graph_module"] = GraphPickler.dumps(
+                state["graph_module"], Options(ops_filter=None)
+            )
+            state["example_inputs"] = GraphPickler.dumps(state["example_inputs"])
+        return pickle.dumps(state)
+
+    @classmethod
+    def deserialize_compile_artifacts(cls, data: bytes) -> "VllmSerializableFunction":
+        from torch._guards import TracingContext, tracing
+        from torch._subclasses import FakeTensorMode
+        from torch.fx._graph_pickler import GraphPickler
+        from torch.fx.experimental.symbolic_shapes import ShapeEnv
+
+        from vllm.compilation.backends import VllmBackend
+
+        state = pickle.loads(data)
+        fake_mode = FakeTensorMode(shape_env=ShapeEnv())
+        state["graph_module"] = GraphPickler.loads(state["graph_module"], fake_mode)
+        state["example_inputs"] = GraphPickler.loads(state["example_inputs"], fake_mode)
+        vllm_backend = VllmBackend(get_current_vllm_config(), state["prefix"])
+
+        def optimized_call(*example_inputs):
+            """
+            On the first run of the optimized call, we rerun the compiler
+            backend which should result in a cache hit. After the backend
+            call returns, we just do a one-time replacement of the optimized
+            call with the compiled function, so that subsequent calls are on
+            the AOT compiled path.
+            """
+            compile_inputs = [
+                inp or example_inputs[i] for i, inp in enumerate(fn.example_inputs)
+            ]
+            with tracing(TracingContext(fake_mode)):
+                fn.optimized_call = vllm_backend(
+                    state["graph_module"], compile_inputs
+                ).optimized_call
+            return fn.optimized_call(*example_inputs)
+
+        fn = cls(**state, optimized_call=optimized_call)
+        return fn
+
+    @property
+    def co_name(self):
+        """
+        Used for depyf debugging.
+        """
+        return "VllmSerializableFunction"
+
+
+def compilation_config_hash_factors(vllm_config: VllmConfig) -> list[str]:
+    factors = []
+    # 0. factors come from the env, for example, The values of
+    # VLLM_PP_LAYER_PARTITION will affect the computation graph.
+    env_hash = envs.compute_hash()
+    factors.append(env_hash)
+
+    # 1. factors come from the vllm_config (it mainly summarizes how the
+    #    model is created)
+    config_hash = vllm_config.compute_hash()
+    factors.append(config_hash)
+    return factors
+
+
+def _compute_code_hash_with_content(file_contents: dict[str, str]) -> str:
+    items = list(sorted(file_contents.items(), key=lambda x: x[0]))
+    hash_content = []
+    for filepath, content in items:
+        hash_content.append(filepath)
+        if filepath == "<string>":
+            # This means the function was dynamically generated, with
+            # e.g. exec(). We can't actually check these.
+            continue
+        hash_content.append(content)
+    return hashlib.md5(
+        "\n".join(hash_content).encode(), usedforsecurity=False
+    ).hexdigest()
+
+
+def _compute_code_hash(files: set[str]) -> str:
+    logger.debug(
+        "Traced files (to be considered for compilation cache):\n%s", "\n".join(files)
+    )
+    file_contents = {}
+    for filepath in files:
+        if filepath == "<string>":
+            file_contents[filepath] = ""
+        else:
+            with open(filepath) as f:
+                file_contents[filepath] = f.read()
+    return _compute_code_hash_with_content(file_contents)

vllm/compilation/compiler_interface.py

@@ -199,6 +199,7 @@ class InductorStandaloneAdaptor(CompilerInterface):
         if compiler_config is not None:
             current_config.update(compiler_config)
         set_inductor_config(current_config, runtime_shape)
+        set_functorch_config()
 
         if isinstance(runtime_shape, int):
             dynamic_shapes = "from_example_inputs"
@@ -307,6 +308,7 @@ class InductorAdaptor(CompilerInterface):
         current_config["fx_graph_remote_cache"] = False
 
         set_inductor_config(current_config, runtime_shape)
+        set_functorch_config()
 
         # inductor can inplace modify the graph, so we need to copy it
         # see https://github.com/pytorch/pytorch/issues/138980
@@ -596,6 +598,10 @@ def set_inductor_config(config, runtime_shape):
         )
 
 
+def set_functorch_config():
+    torch._functorch.config.bundled_autograd_cache = False
+
+
 class EagerAdaptor(CompilerInterface):
     name = "eager"
 

vllm/compilation/decorators.py

@@ -2,7 +2,10 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 import contextlib
+import hashlib
 import inspect
+import os
+import sys
 from typing import Callable, Optional, TypeVar, Union, overload
 from unittest.mock import patch
 
@@ -11,9 +14,10 @@ import torch.nn as nn
 from packaging import version
 from torch._dynamo.symbolic_convert import InliningInstructionTranslator
 
+import vllm.envs as envs
 from vllm.compilation.counter import compilation_counter
 from vllm.compilation.wrapper import TorchCompileWrapperWithCustomDispatcher
-from vllm.config import CompilationLevel, VllmConfig
+from vllm.config import CompilationLevel, VllmConfig, set_current_vllm_config
 from vllm.logger import init_logger
 from vllm.sequence import IntermediateTensors
 from vllm.utils import resolve_obj_by_qualname, supports_dynamo
@@ -176,6 +180,33 @@ def support_torch_compile(
     return cls_decorator_helper
 
 
+def _model_hash_key(fn) -> str:
+    import vllm
+
+    sha256_hash = hashlib.sha256()
+    sha256_hash.update(vllm.__version__.encode())
+    sha256_hash.update(fn.__qualname__.encode())
+    sha256_hash.update(str(fn.__code__.co_firstlineno).encode())
+    return sha256_hash.hexdigest()
+
+
+def _verify_source_unchanged(source_info, vllm_config) -> None:
+    from .caching import _compute_code_hash, _compute_code_hash_with_content
+
+    file_contents = {}
+    for source in source_info.inlined_sources:
+        module = sys.modules[source.module]
+        file = inspect.getfile(module)
+        vllm_config.compilation_config.traced_files.add(file)
+        file_contents[file] = source.content
+    expected_checksum = _compute_code_hash_with_content(file_contents)
+    actual_checksum = _compute_code_hash(set(file_contents.keys()))
+    if expected_checksum != actual_checksum:
+        raise RuntimeError(
+            "Source code has changed since the last compilation. Recompiling the model."
+        )
+
+
 def _support_torch_compile(
     cls: _T,
     dynamic_arg_dims: dict[str, Union[int, list[int]]],
@@ -227,6 +258,64 @@ def _support_torch_compile(
         if self.do_not_compile or torch.compiler.is_compiling():
             return self.forward(*args, **kwargs)
 
+        if getattr(self, "aot_compiled_fn", None) is not None:
+            return self.aot_compiled_fn(self, *args, **kwargs)
+
+        cache_dir = None
+        aot_compilation_path = None
+        if envs.VLLM_USE_AOT_COMPILE:
+            """
+            When using torch.compile in AOT mode, we store the cache artifacts
+            under VLLM_CACHE_ROOT/torch_aot_compile/{hash}/rank_i_j. The {hash}
+            contains all of the factors except for the source files being
+            traced through, because we don't actually know which source files
+            to check at this point (before dynamo runs).
+            On loading we will actually look at the source files being traced
+            through. If any source file have changed (compared with the
+            serialized backend artifacts), then we need to generate a new AOT
+            compile artifact from scratch.
+            """
+            from .caching import compilation_config_hash_factors
+
+            factors: list[str] = compilation_config_hash_factors(self.vllm_config)
+
+            factors.append(_model_hash_key(self.forward))
+            hash_key = hashlib.sha256(str(factors).encode()).hexdigest()
+
+            cache_dir = os.path.join(
+                envs.VLLM_CACHE_ROOT,
+                "torch_aot_compile",
+                hash_key,
+            )
+
+            rank = self.vllm_config.parallel_config.rank
+            dp_rank = self.vllm_config.parallel_config.data_parallel_rank
+            cache_dir = os.path.join(cache_dir, f"rank_{rank}_{dp_rank}")
+            aot_compilation_path = os.path.join(cache_dir, "model")
+            try:
+                with (
+                    set_current_vllm_config(self.vllm_config),
+                    open(aot_compilation_path, "rb") as f,
+                ):
+                    start_monitoring_torch_compile(self.vllm_config)
+                    loaded_fn = torch.compiler.load_compiled_function(f)
+                _verify_source_unchanged(loaded_fn.source_info(), self.vllm_config)
+                self.aot_compiled_fn = loaded_fn
+            except Exception as e:
+                if os.path.exists(aot_compilation_path):
+                    logger.warning(
+                        "Cannot load aot compilation from path %s, error: %s",
+                        aot_compilation_path,
+                        str(e),
+                    )
+                if envs.VLLM_FORCE_AOT_LOAD:
+                    raise e
+            if getattr(self, "aot_compiled_fn", None) is not None:
+                logger.info(
+                    "Directly load AOT compilation from path %s", aot_compilation_path
+                )
+                return self.aot_compiled_fn(self, *args, **kwargs)
+
         # the first compilation needs to have dynamic shapes marked
         if len(self.compiled_codes) < 1:
             sig = inspect.signature(self.__class__.forward)
@@ -275,15 +364,15 @@ def _support_torch_compile(
             )
 
             # 2. every time Dynamo sees a function call, it will inline
-            # the function by calling InliningInstructionTranslator.inline_call
+            # the function by calling InliningInstructionTranslator.inline_call_
             # we hijack this function to know all the functions called
             # during Dynamo tracing, and their corresponding files
-            inline_call = InliningInstructionTranslator.inline_call
+            inline_call = InliningInstructionTranslator.inline_call_
 
-            def patched_inline_call(parent, func, args, kwargs):
-                code = func.get_code()
+            def patched_inline_call(self_):
+                code = self_.f_code
                 self.vllm_config.compilation_config.traced_files.add(code.co_filename)
-                return inline_call(parent, func, args, kwargs)
+                return inline_call(self_)
 
             # Disable the C++ compilation of symbolic shape guards. C++-fication
             # of symbolic shape guards can improve guard overhead. But, since
@@ -300,13 +389,21 @@ def _support_torch_compile(
 
             with (
                 patch.object(
-                    InliningInstructionTranslator, "inline_call", patched_inline_call
+                    InliningInstructionTranslator, "inline_call_", patched_inline_call
                 ),
                 torch._dynamo.config.patch(**dynamo_config_patches),
                 maybe_use_cudagraph_partition_wrapper(self.vllm_config),
                 _torch27_patch_tensor_subclasses(),
             ):
-                output = self.compiled_callable(*args, **kwargs)
+                if envs.VLLM_USE_AOT_COMPILE:
+                    self.aot_compiled_fn = self.aot_compile(*args, **kwargs)
+                    output = self.aot_compiled_fn(self, *args, **kwargs)
+                    assert aot_compilation_path is not None
+                    assert cache_dir is not None
+                    os.makedirs(cache_dir, exist_ok=True)
+                    self.aot_compiled_fn.save_compiled_function(aot_compilation_path)
+                else:
+                    output = self.compiled_callable(*args, **kwargs)
             return output
 
         # usually, capturing the model once is enough, and then we can

vllm/compilation/wrapper.py

@@ -10,6 +10,7 @@ from typing import Callable, Optional
 
 import torch
 
+import vllm.envs as envs
 from vllm.config import CompilationLevel, CUDAGraphMode, get_current_vllm_config
 from vllm.logger import init_logger
 
@@ -44,6 +45,19 @@ class TorchCompileWrapperWithCustomDispatcher:
                 options = (
                     get_current_vllm_config().compilation_config.inductor_compile_config
                 )
+            if envs.VLLM_USE_AOT_COMPILE:
+                options = options or {}
+                # This effectively drop all the guards.
+                # We need this because bytecode hook is not used any more to
+                # drop guards in the AOT compile mode.
+                options["guard_filter_fn"] = lambda guards: [False for _ in guards]
+                if hasattr(torch._dynamo.config, "enable_aot_compile"):
+                    torch._dynamo.config.enable_aot_compile = True
+                else:
+                    msg = "torch._dynamo.config.enable_aot_compile is not "
+                    msg += "available. AOT compile is disabled and please "
+                    msg += "upgrade PyTorch version to use AOT compile."
+                    logger.warning(msg)
 
             compiled_callable = torch.compile(
                 self.forward, fullgraph=True, backend=backend, options=options
@@ -61,6 +75,15 @@ class TorchCompileWrapperWithCustomDispatcher:
             compilation_level >= CompilationLevel.DYNAMO_ONCE
         )
 
+    def aot_compile(self, *args, **kwargs):
+        if not hasattr(self.compiled_callable, "aot_compile"):
+            raise RuntimeError(
+                "aot_compile is not supported by the current configuration. "
+                + "Please make sure torch.compile is enabled with the latest "
+                + f"version of PyTorch (current using torch: {torch.__version__})"
+            )
+        return self.compiled_callable.aot_compile((args, kwargs))
+
     def __call__(self, *args, **kwargs):
         """Implement the dispatch logic here, beyond the torch.compile level.
         NOTE: this function can have additional arguments beyond the forward

vllm/envs.py

@@ -89,6 +89,8 @@ if TYPE_CHECKING:
     VLLM_TORCH_PROFILER_DIR: Optional[str] = None
     VLLM_TORCH_PROFILER_RECORD_SHAPES: bool = False
     VLLM_TORCH_PROFILER_WITH_PROFILE_MEMORY: bool = False
+    VLLM_USE_AOT_COMPILE: bool = False
+    VLLM_FORCE_AOT_LOAD: bool = False
     VLLM_TORCH_PROFILER_WITH_STACK: bool = True
     VLLM_TORCH_PROFILER_WITH_FLOPS: bool = False
     VLLM_USE_TRITON_AWQ: bool = False
@@ -235,6 +237,13 @@ def maybe_convert_bool(value: Optional[str]) -> Optional[bool]:
     return bool(int(value))
 
 
+def use_aot_compile() -> bool:
+    from vllm.utils import is_torch_equal_or_newer
+
+    default_value = "1" if is_torch_equal_or_newer("2.10.0.dev") else "0"
+    return os.environ.get("VLLM_USE_AOT_COMPILE", default_value) == "1"
+
+
 def env_with_choices(
     env_name: str,
     default: Optional[str],
@@ -494,6 +503,14 @@ environment_variables: dict[str, Callable[[], Any]] = {
     # Dump fx graphs to the given directory.
     # It will override CompilationConfig.debug_dump_path if set.
     "VLLM_DEBUG_DUMP_PATH": lambda: os.environ.get("VLLM_DEBUG_DUMP_PATH", None),
+    # Feature flag to enable/disable AOT compilation. This will ensure
+    # compilation is done in warmup phase and the compilation will be
+    # reused in subsequent calls.
+    "VLLM_USE_AOT_COMPILE": use_aot_compile,
+    # Force vllm to always load AOT compiled models from disk. Failure
+    # to load will result in a hard error when this is enabled.
+    # Will be ignored when VLLM_USE_AOT_COMPILE is disabled.
+    "VLLM_FORCE_AOT_LOAD": lambda: os.environ.get("VLLM_FORCE_AOT_LOAD", "0") == "1",
     # local rank of the process in the distributed setting, used to determine
     # the GPU device id
     "LOCAL_RANK": lambda: int(os.environ.get("LOCAL_RANK", "0")),