Unexpected bus error encountered in worker. This might be caused by insufficient shared memory(shm)

训练模型时，容器的共享内存不够导致出错：
ERROR: Unexpected bus error encountered in worker. This might be caused by insufficient shared memory (shm).

RuntimeError: DataLoader worker (pid 4236) is killed by signal: Bus error. It is possible that dataloader’s workers are out of shared memory. Please try to raise your shared memory limit.

RuntimeError: DataLoader worker (pid(s) 4236) exited unexpectedly

解决方法：
1 docker ps -a 找到自己的容器id，即CONTAINER ID。以我的为例子，我的是7331d7806ecd

2 执行下面命令，得到另一个Id.

docker inspect 7331d7806ecd | grep Id"Id": "7331d7806ecd42bf6490c6e0aa2a631f9bd66694f97c9ac91d77b9b1240f52c2",

3.执行cd /var/lib/docker/containers, ls一下，找到 Id，cd 进去。

4.再ls一下，发现有个hostconfig.json文件，先别编辑，先停止一下容器，即systemctl stop docker 或者 service docker stop。
然后再编辑，即vi hostconfig.json。

5.改shmsize的大小为8G："ShmSize":8589934592

6.最后执行下面命令，重启容器

systemctl restart docker
docker start 7331d7806ecd
docker exec -it 7331d7806ecd /bin/bash

可以df命令看一下结果。

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