2016-03-02 12:29:19 +00:00
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.. _memory:
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Memory
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======
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Glances uses two columns: one for the ``RAM`` and one for the ``SWAP``.
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.. image:: ../_static/mem.png
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If enough space is available, Glances displays extended information for
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the ``RAM``:
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.. image:: ../_static/mem-wide.png
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2019-10-13 09:18:00 +00:00
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Stats description:
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- **percent**: the percentage usage calculated as (total-available)/total*100.
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- **total**: total physical memory available.
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- **used**: memory used, calculated differently depending on the platform and
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designed for informational purposes only.
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2022-04-10 13:53:22 +00:00
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It's compute as following:
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used memory = total - free (with free = available + buffers + cached)
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2019-10-13 09:18:00 +00:00
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- **free**: memory not being used at all (zeroed) that is readily available;
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note that this doesn’t reflect the actual memory available (use ‘available’
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instead).
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- **active**: (UNIX): memory currently in use or very recently used, and so it
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is in RAM.
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- **inactive**: (UNIX): memory that is marked as not used.
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- **buffers**: (Linux, BSD): cache for things like file system metadata.
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- **cached**: (Linux, BSD): cache for various things.
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Additional stats available in through the API:
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- **available**: the actual amount of available memory that can be given
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instantly to processes that request more memory in bytes; this is calculated
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by summing different memory values depending on the platform (e.g. free +
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buffers + cached on Linux) and it is supposed to be used to monitor actual
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memory usage in a cross platform fashion.
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- **wired**: (BSD, macOS): memory that is marked to always stay in RAM. It is
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never moved to disk.
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- **shared**: (BSD): memory that may be simultaneously accessed by multiple
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processes.
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2017-05-08 07:46:40 +00:00
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A character is also displayed just after the MEM header and shows the
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trend value:
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======== ==============================================================
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Trend Status
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======== ==============================================================
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``-`` MEM value is equal to the mean of the six latests refreshes
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``\`` MEM value is lower than the mean of the six latests refreshes
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``/`` MEM value is higher than the mean of the six latests refreshes
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======== ==============================================================
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2016-03-02 12:29:19 +00:00
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Alerts are only set for used memory and used swap.
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Legend:
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======== ============
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RAM/Swap Status
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======== ============
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``<50%`` ``OK``
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``>50%`` ``CAREFUL``
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``>70%`` ``WARNING``
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``>90%`` ``CRITICAL``
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======== ============
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.. note::
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Limit values can be overwritten in the configuration file under
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the ``[memory]`` and/or ``[memswap]`` sections.
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