From WHM's Service Status screen, how is "Memory Used" calculated?

Question

From WHM's Service Status screen, how is "Memory Used" calculated?

Answer

The value is calculated using the following formula:

"Memory Used" = MemTotal - MemFree - Cached - Buffers

And the values in the calculation are pulled from the /proc/meminfo file. You can view them using the following command:

egrep '^MemTotal|^MemFree|^Cached|^Buffers' /proc/meminfo