Task Manager shows disk I/O only for one worker on Windows with `num_workers>0`

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Hi,

I was training on a Windows machine with num_workers > 0 and found in the task manager that only one worker has disk I/O.
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So i inserted this block to collate_fn and saw multiple workers working.

pid = os.getpid()
wid = torch.utils.data.get_worker_info().id
print(f"[PID={pid}/WID={wid}]")

Is this a bug in task manager, or is there more to it?