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Process finished with exit code 137 (interrupted by signal 9: SIGKILL)

前几天突然遇到这个问题：

Process finished with exit code 137 (interrupted by signal 9: SIGKILL) 

程序启动后被系统KILLED，在网上找了资料，发现是说内存不足的问题

查询内存使用情况，发现大多数内存都被缓存占据了

$ free -h
              total        used        free      shared  buff/cache   available
Mem:            62G         13G        450M        308M         49G         48G
Swap:          7.6G        4.2G        3.4G

额外阅读

• Process finished with exit code 137 in PyCharm
• multiprocessing.set_start_method(method)
• Semaphore leaks in dataloader