Free command to view memory
Mem: physical memory usage
Swap: swapping partition information
+ buffers/cache: (available) amount of memory, i.e. free+buffers+cached
-buffers/cache: (used) number of memory, i.e. used-buffers-cached
Total: the total physical memory size is currently 980m
Used: the physical memory size that has been used is currently 852m
Free: the free physical memory is currently 127m
Shared: the amount of physical memory shared by multiple processes
Buffers Buffer: the current buffer memory is 73m
Cached Page: current 218m cache memory
The formula for calculating the available memory is:
Available memory = free+buffers+cached
That is 127MB+73MB+218MB=420MB
