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Memory plugin
Type: read
Callbacks: init, read
Status: supported
First version: 1.0
Copyright: 2005–2008 Florian octo Forster
2009 Manuel Sanmartin
License: GPLv2
Manpage: n/a
List of Plugins


The Memory plugin collects physical memory utilization.

The values are reported by their use by the operating system. Under Linux, the categories are:

  • Used
  • Buffered
  • Cached
  • Free

Free memory is memory you paid for, that's using power and that doesn't do anything useful. It is normal that the operating system puts that memory to use, for example by caching files it has accessed (reported as Cached under Linux).

Virtual memory statistics can be collected with the vmem plugin under Linux.

Example graph



  • Linux
    • /proc-file system
  • Solaris
    • libkstat(3KSTAT)
  • AIX
    • libperfstat(3)

See also