分析系统运行状态

一 系统使用内存和应用使用内存的区别

[root@localhost monitor_man]# free -m

total used free shared buff/cache available

Mem: 993 301 350 7 340 515

Swap: 4095 0 4095

系统使用内存=total-free

应用使用内存=total-(free+cache+buff)

 

二 内存中cache和buffer区别

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-->