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63 lines
2.2 KiB
ReStructuredText
63 lines
2.2 KiB
ReStructuredText
.. _load:
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Load
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====
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*Availability: Unix and Windows with a PsUtil version >= 5.6.2*
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.. image:: ../_static/load.png
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On the *No Sheep* blog, Zachary Tirrell defines the `load average`_
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on GNU/Linux operating system:
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"In short it is the average sum of the number of processes
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waiting in the run-queue plus the number currently executing
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over 1, 5, and 15 minutes time periods."
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Be aware that Load on Linux, BSD and Windows are different things, high
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`load on BSD`_ does not means high CPU load. The Windows load is emulated
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by the PsUtil lib (see `load on Windows`_)
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Glances gets the number of CPU core (displayed on the first line) to adapt
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the alerts. Alerts on load average are only set on 15 minutes time period.
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Thresholds are computed by dividing the 5 and 15 minutes average load per
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CPU(s) number. For example, if you have 4 CPUs and the 5 minutes load is
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1.0, then the warning threshold will be set to 2.8 (0.7 * 4 * 1.0).
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From Glances 3.1.4, if Irix/Solaris mode is off ('0' key), the value is
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divided by logical core number and multiple by 100 to have load as a
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percentage.
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.. image:: ../_static/loadpercent.png
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A character is also displayed just after the LOAD header and shows the
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trend value (for the 1 minute load stat):
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======== ==============================================================
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Trend Status
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======== ==============================================================
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``-`` Mean 15 lasts values equal mean 15 previous values
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``↓`` Mean 15 lasts values is lower mean 15 previous values
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``↑`` Mean 15 lasts values is higher mean 15 previous valuess
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======== ==============================================================
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Legend:
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============= ============
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Load avg Status
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============= ============
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``<0.7*core`` ``OK``
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``>0.7*core`` ``CAREFUL``
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``>1*core`` ``WARNING``
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``>5*core`` ``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 ``[load]`` section.
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.. _load average: http://nosheep.net/story/defining-unix-load-average/
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.. _load on BSD: http://undeadly.org/cgi?action=article&sid=20090715034920
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.. _load on Windows: https://psutil.readthedocs.io/en/latest/#psutil.getloadavg
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