http://hehe2.net/linuxhowto/3-reasons-why-your-system-might-be-slow/
1. CPU 资源被占用 --> top => renice 20 26210 => kill 26210
2. 物理内存几乎被用完 --> free -m => top => shutdown the program that’s using the most memory.
3. 大量的IO操作 --> top => atop => ionice -p30956 -n7
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