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feat(utility): ensure atomic checkpoint updates in RuntimeContext.save #189

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Merged
hzhangxyz merged 1 commit into from
Mar 5, 2026
Merged

feat(utility): ensure atomic checkpoint updates in RuntimeContext.save #189

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8 changes: 5 additions & 3 deletions qmp/utility/context.py
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Original file line number Diff line number Diff line change
Expand Up @@ -112,11 +112,13 @@ def save(self, data: typing.Any, step: int) -> None:
data_path = self.folder() / "data.pth"
local_data_path = self.folder() / f"data.{step}.pth"
torch.save(data, local_data_path)
data_path.unlink(missing_ok=True)
if step % self.checkpoint_interval == 0:
data_path.symlink_to(f"data.{step}.pth")
temp_data_path = self.folder() / "data.pth.tmp"
temp_data_path.unlink(missing_ok=True)
temp_data_path.symlink_to(f"data.{step}.pth")
temp_data_path.replace(data_path)
else:
local_data_path.rename(data_path)
local_data_path.replace(data_path)
if self.max_relative_step is not None:
self.max_absolute_step = step + self.max_relative_step - 1
self.max_relative_step = None
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