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.. _memory:
Memory
======
Glances uses two columns: one for the ``RAM`` and one for the ``SWAP``.
.. image:: ../_static/mem.png
If enough space is available, Glances displays extended information for
the ``RAM``:
.. image:: ../_static/mem-wide.png
Stats description:
- **percent**: the percentage usage calculated as (total-available)/total*100.
- **total**: total physical memory available.
- **used**: memory used, calculated differently depending on the platform and
designed for informational purposes only.
It's compute as following:
used memory = total - free (with free = available + buffers + cached)
- **free**: memory not being used at all (zeroed) that is readily available;
note that this doesn’t reflect the actual memory available (use ‘available’
instead).
- **active**: (UNIX): memory currently in use or very recently used, and so it
is in RAM.
- **inactive**: (UNIX): memory that is marked as not used.
- **buffers**: (Linux, BSD): cache for things like file system metadata.
- **cached**: (Linux, BSD): cache for various things.
Additional stats available in through the API:
- **available**: the actual amount of available memory that can be given
instantly to processes that request more memory in bytes; this is calculated
by summing different memory values depending on the platform (e.g. free +
buffers + cached on Linux) and it is supposed to be used to monitor actual
memory usage in a cross platform fashion.
- **wired**: (BSD, macOS): memory that is marked to always stay in RAM. It is
never moved to disk.
- **shared**: (BSD): memory that may be simultaneously accessed by multiple
processes.
A character is also displayed just after the MEM header and shows the
trend value:
======== ==============================================================
Trend Status
======== ==============================================================
``-`` MEM value is equal to the mean of the six latests refreshes
``\`` MEM value is lower than the mean of the six latests refreshes
``/`` MEM value is higher than the mean of the six latests refreshes
======== ==============================================================
Alerts are only set for used memory and used swap.
Legend:
======== ============
RAM/Swap Status
======== ============
``<50%`` ``OK``
``>50%`` ``CAREFUL``
``>70%`` ``WARNING``
``>90%`` ``CRITICAL``
======== ============
.. note::
Limit values can be overwritten in the configuration file under
the ``[memory]`` and/or ``[memswap]`` sections.
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