This topic describes how Cloud Monitor calculates the memory usage.

Cloud Monitor uses the following formula to calculate the memory usage:

(mem_total - (mem_free + mem_buffer + mem_cache))/mem_total

You can run the cat/proc/meminfo command to view the values of mem_free, mem_buffer, and mem_cache. Example: 

[root@localhost ~]# cat /proc/meminfo MemTotal: 8011936 kBMemFree: 227336 kBBuffers: 277872 kBCached: 1451828 kB

Calculation process: (8,011,936 - (227,336 + 277,872 + 1,451,828))/8,011,936

Calculation result: The memory usage is about 75%.