在调试一个爬虫程序时，发现一个非常奇怪的问题，程序总是在运行一段时候会被系统给Kill掉，在syslog里看到：
Nov 9 11:52:20 iZrj9iqn00z9x3jgz1v2t5Z kernel: [5542452.233851] Out of memory: Kill process 10526 (python3) score 738 or sacrifice child
服务器是1台2G内存的云服务器，内存不够？那就暂时使用虚拟内存扩充上来：
swapoff -a
dd if=/dev/zero of=swapfile bs=1024 count=4000000
mkswap swapfile
swapon swapfile
这样就临时加了4G虚拟内存上来，保证程序在峰值运行时不被kill。
参考：https://plumbr.io/blog/memory-leaks/out-of-memory-kill-process-or-sacrifice-child
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