This graph shows what the machine uses its memory for.
|active||active||gauge||pages recently statistically used|
|inactive||inactive||gauge||pages recently statistically unused|
|wired||wired||gauge||pages that are fixed into memory, usually for kernel purposes, but also sometimes for special use in processes|
|buffers||buffers||gauge||pages used for filesystem buffers|
|cache||cached||gauge||pages that have percolated from inactive to a status where they maintain their data, but can often be immediately reused|
|free||free||gauge||pages without data content|
|swap||swap||gauge||Swap space used|