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.. _cpu:
CPU
===
The CPU stats are shown as a percentage or value and for the configured
refresh time. The total CPU usage is displayed on the first line.
.. image:: ../_static/cpu.png
If enough horizontal space is available, extended CPU information are
displayed.
.. image:: ../_static/cpu-wide.png
CPU stats description:
* user: percent time spent in user space
* system: percent time spent in kernel space
* idle: percent of CPU used by any program
* nice: percent time occupied by user level processes with a positive nice value
* irq: percent time spent servicing/handling hardware/software interrupts
* iowait: percent time spent in wait (on disk)
* steal: percent time in involuntary wait by virtual cpu while hypervisor is servicing another processor/virtual machine
* ctx_sw: number of context switches (voluntary + involuntary) per second
* inter: number of interrupts per second
* sw_inter: number of software interrupts per second. Always set to 0 on Windows and SunOS.
* syscal: number of system calls per second. Do not displayed on Linux (always 0).
To switch to per-CPU stats, just hit the ``1`` key:
.. image:: ../_static/per-cpu.png
By default, ``steal`` CPU time alerts aren't logged. If you want that,
just add to the configuration file:
.. code-block:: ini
[cpu]
steal_log=True
Legend:
================= ============
CPU (user/system) Status
================= ============
``<50%`` ``OK``
``>50%`` ``CAREFUL``
``>70%`` ``WARNING``
``>90%`` ``CRITICAL``
================= ============
.. note::
Limit values can be overwritten in the configuration file under
the ``[cpu]`` and/or ``[percpu]`` sections.
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