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address flagBuffer ownership issue (#749)

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This pull request updates the handling of the default flag buffer in the
C++ and Python bindings to ensure proper memory management when
interfacing with Python.

Make sure the buffer will not be deallocated when transfer ownership
from cpp to python
This commit is contained in:
Binyang Li
2026-02-20 13:42:29 -08:00
committed by GitHub
parent 4701ae3a95
commit 39865c218b
6 changed files with 39 additions and 22 deletions
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4
python/mscclpp/ext/algorithm_collection_builder.py
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@@ -3,7 +3,7 @@
from __future__ import annotations
from typing import Union
from mscclpp._core.algorithm import Algorithm, AlgorithmBuilder, AlgorithmCollection, get_default_flag_buffer
from mscclpp._core.algorithm import Algorithm, AlgorithmBuilder, AlgorithmCollection, get_flag_buffer
import atexit
from mscclpp._mscclpp import CppAlgorithmCollectionBuilder
@@ -58,7 +58,7 @@ class AlgorithmCollectionBuilder:
rank: int,
) -> AlgorithmCollection:
if self._flag_buffer is None:
self._flag_buffer = get_default_flag_buffer()
self._flag_buffer = get_flag_buffer()
native_collection = self._builder.build_default_algorithms(
int(scratch_buffer), scratch_buffer_size, self._flag_buffer.data.ptr, self._flag_buffer.nbytes, rank
)