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查看当前系统状态：
free -h total used free shared buff/cache available Mem: 15Gi 3.2Gi 4.1Gi
8.0Mi 8.0Gi 11Gi Swap: 0B 0B 0B
一、下面先解释一下输出的内容：
Mem 行(第二行)：是内存的使用情况。 Swap 行(第三行)：是交换空间的使用情况。 total： 列显示系统总的可用物理内存和交换空间大小。
used： 列显示已经被使用的物理内存和交换空间。 free： 列显示还有多少物理内存和交换空间可用使用。 shared： 列显示被共享使用的物理内存大小。
buff/cache： 列显示被 buffer 和 cache 使用的物理内存大小。 available： 列显示还可以被应用程序使用的物理内存大小。
二、linux服务器内粗缓存过高导致运行慢
执行如下命令清除缓存：
echo 1 > /proc/sys/vm/drop_caches
当然，这个文件可以设置的值分别为1、2、3。
echo 1 > /proc/sys/vm/drop_caches echo 2 > /proc/sys/vm/drop_caches echo 3 >
/proc/sys/vm/drop_caches 它们所表示的含义为： echo 1 >
/proc/sys/vm/drop_caches：表示清除pagecache。 echo 2 >
/proc/sys/vm/drop_caches：表示清除回收slab分配器中的对象（包括目录项缓存和inode缓存）。
slab分配器是内核中管理内存的一种机制，其中很多缓存数据实现都是用的pagecache。 echo 3 >
/proc/sys/vm/drop_caches：表示清除pagecache和slab分配器中的缓存对象。
三、执行命令
free -h total used free shared buff/cache available Mem: 15Gi 3.2Gi 4.1Gi
8.0Mi 8.0Gi 11Gi Swap: 0B 0B 0B echo 1 > /proc/sys/vm/drop_caches free -h total
used free shared buff/cache available Mem: 15Gi 3.2Gi 11Gi 8.0Mi 162Mi 11Gi
Swap: 0B 0B 0B echo 2 > /proc/sys/vm/drop_caches free -h total used free shared
buff/cache available Mem: 15Gi 3.2Gi 12Gi 8.0Mi 144Mi 11Gi Swap: 0B 0B 0B echo
3 > /proc/sys/vm/drop_caches free -h total used free shared buff/cache
available Mem: 15Gi 3.2Gi 12Gi 8.0Mi 144Mi 11Gi Swap: 0B 0B 0B
