ERROR: Unexpected BUS error encountered in DataLoader worker. This might be caused by insufficient shared memory (shm),

reason

Set the number of num_workers is larger than the actual situation

Solution:

Change num_workers  to 0, or half the number of cores. It can also be configured not to let the system automatically obtain

The error message is as follows:

ERROR: Unexpected BUS error encountered in DataLoader worker. This might be caused by insufficient shared memory (shm), please check whether use_shared_memory is set and storage space in /dev/shm is enough
Traceback (most recent call last):
  File "train.py", line 72, in <module>
    use_vdl=True)  # 其用visuadl进行可视化训练记录
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlex/cv/models/detector.py", line 334, in train
    use_vdl=use_vdl)
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddlex/cv/models/base.py", line 333, in train_loop
    Exception in thread Thread-3:
Traceback (most recent call last):
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py", line 583, in _get_data
    data = self._data_queue.get(timeout=self._timeout)
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/multiprocessing/queues.py", line 105, in get
    raise Empty
_queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/threading.py", line 926, in _bootstrap_inner
    self.run()
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py", line 505, in _thread_loop
    batch = self._get_data()
  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py", line 599, in _get_data
    "pids: {}".format(len(failed_workers), pids))
RuntimeError: DataLoader 1 workers exit unexpectedly, pids: 4652
for step, data in enumerate(self.train_data_loader()):

  File "/opt/conda/envs/python35-paddle120-env/lib/python3.7/site-packages/paddle/fluid/dataloader/dataloader_iter.py", line 697, in __next__
    data = self._reader.read_next_var_list()
SystemError: (Fatal) Blocking queue is killed because the data reader raises an exception.
  [Hint: Expected killed_ != true, but received killed_:1 == true:1.] (at /paddle/paddle/fluid/operators/reader/blocking_queue.h:166)