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use the same stream for cuda graph catpure and replay for NCCL (#29207)

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Signed-off-by: Amir Samani <asamani@nvidia.com>
Signed-off-by: youkaichao <youkaichao@gmail.com>
Co-authored-by: youkaichao <youkaichao@gmail.com>
This commit is contained in:
Amir Samani
2025-12-25 03:10:03 -08:00
committed by GitHub
parent 2532f437ee
commit 030fc44914
4 changed files with 23 additions and 27 deletions
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30
tests/utils_/test_torch_utils.py
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@@ -99,30 +99,18 @@ def _test_stream_thread(main_expected_stream: torch.cuda.Stream):
def test_current_stream_multithread():
from vllm.platforms import current_platform
if not torch.cuda.is_available():
pytest.skip("CUDA not available")
if current_platform.is_rocm():
main_dedicated_stream = current_stream()
main_dedicated_stream = current_stream()
assert main_dedicated_stream.cuda_stream != 0, (
"ROCm should create a dedicated stream, not use default stream (0x0)"
)
assert main_dedicated_stream.cuda_stream != 0, (
"ROCm/CUDA should create a dedicated stream, not use default stream (0x0)"
)
main_stream_again = current_stream()
assert main_stream_again == main_dedicated_stream, (
"Multiple calls to current_stream should return the same dedicated stream"
)
main_stream_again = current_stream()
assert main_stream_again == main_dedicated_stream, (
"Multiple calls to current_stream should return the same dedicated stream"
)
_test_stream_thread(main_dedicated_stream)
else:
main_default_stream = torch.cuda.default_stream()
main_initial_stream = current_stream()
assert main_initial_stream == main_default_stream, (
"First call to current_stream should return default stream on CUDA"
)
_test_stream_thread(main_default_stream)
_test_stream_thread(main_dedicated_stream)