About Memory Utilization on Linux
Like other Linux monitoring tools, including "free" and the GNOME Task Manager, CloudTest monitoring intentionally excludes buffered and cached memory from the total usage statistics presented.
CloudTest excludes kernel buffers and cache because Linux is
- Very aggressive about grabbing all the free RAM for kernel buffers and cache, and
- will give it back to user-level programs as soon as needed.
What you should see
Without these exclusions, the memory usage would almost always display at 99-100% of the physical RAM on the machine for the reasons above.