UserWarning: semaphore_tracker: There appear to be 4 leaked semaphores to clean up at shutdown

• 在docker容器中运行多线程程序时Segmentation fault (core dumped)，这时报UserWarning: semaphore_tracker: There appear to be 4 leaked semaphores to clean up at shutdown
  • 原因是在docker中运行，shm 设置太小，导致share memory 不够
  • 可以在容器中df -lh查看shm大小
  • 忽略这个警告可以通过export PYTHONWARNINGS='ignore:semaphore_tracker:UserWarning'
• 参考https://blog.csdn.net/weixin_43915709/article/details/100985631