如下图所示，free和buff/cache有什么区别呢？
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查看 free(1) - Linux manual page
free - Unused memory (MemFree and SwapFree in /proc/meminfo) 未使用的内存，包括交换区buff/cache - Sum of buffers and cache 缓冲区和缓存的总大小
free - Display amount of free and used memory in the system
查看 free(1) - Linux manual page
free - Unused memory (MemFree and SwapFree in /proc/meminfo) 未使用的内存，包括交换区
buff/cache - Sum of buffers and cache 缓冲区和缓存的总大小
free - Display amount of free and used memory in the system