fix: skip aio wait when swap tensors is empty #7712
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Add check for swap_tensors length before assertion.
sfc-gh-truwase
approved these changes
Dec 4, 2025
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This PR fixes #7703.
The root cause is that when
swap_tensorsis empty, no AIO request is queued. However,aio.wait()still checks whether any AIO request has been issued, which can lead to_num_pending_ops == 0and trigger the issue:DeepSpeed/csrc/aio/py_lib/deepspeed_py_io_handle.cpp
Line 191 in c069ceb
The fix is to skip
aio_handle.wait()when there are no swap tensors queued.