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Allow configuring the default torch.compile backend #12

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Allow configuring the default torch.compile backend #12

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a166341
Add custom device compile backend plugins
ryan-li-ryanllli-aws Oct 15, 2026
131150f
Simplify compile backend configuration
ryan-li-ryanllli-aws Oct 15, 2026
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20 changes: 19 additions & 1 deletion tests/unit_tests/cpu/tools/test_tools_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,11 @@
import torch

from torchtitan.tools.garbage_collector import GarbageCollector
from torchtitan.tools.utils import get_cuda_flash_attention_impl, get_local_device
from torchtitan.tools.utils import (
_configure_compile_backend,
get_cuda_flash_attention_impl,
get_local_device,
)


class _FakeDeviceModule:
Expand All @@ -21,6 +25,20 @@ def device_count(self) -> int:
return self.num_devices


def test_configure_compile_backend(monkeypatch: pytest.MonkeyPatch) -> None:
set_default_backend = Mock()
monkeypatch.setenv("TORCHTITAN_COMPILE_BACKEND", "custom_device_backend")
monkeypatch.setattr(
torch.compiler,
"set_default_backend",
set_default_backend,
)

_configure_compile_backend()

set_default_backend.assert_called_once_with("custom_device_backend")


def test_gc_debug_collects_once_per_step(monkeypatch: pytest.MonkeyPatch) -> None:
gc_collect = Mock()
monkeypatch.setattr("torchtitan.tools.garbage_collector.gc.collect", gc_collect)
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7 changes: 7 additions & 0 deletions torchtitan/tools/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,14 @@ def get_device_info() -> tuple[str, ModuleType]:
return device_type, device_module


def _configure_compile_backend() -> None:
"""Configure the default ``torch.compile`` backend from the environment."""
if backend := os.environ.get("TORCHTITAN_COMPILE_BACKEND"):
torch.compiler.set_default_backend(backend)


device_type, device_module = get_device_info()
_configure_compile_backend()


def get_local_device() -> torch.device:
Expand Down
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