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64 lines
2.4 KiB
ReStructuredText
64 lines
2.4 KiB
ReStructuredText
.. _cpu:
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CPU
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===
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The CPU stats are shown as a percentage or value and for the configured
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refresh time. The total CPU usage is displayed on the first line.
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.. image:: ../_static/cpu.png
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If enough horizontal space is available, extended CPU information are
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displayed.
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.. image:: ../_static/cpu-wide.png
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CPU stats description:
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* user: percent time spent in user space
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> User CPU time is time spent on the processor running your program's code (or code in libraries)
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* system: percent time spent in kernel space
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> System CPU time is the time spent running code in the operating system kernel
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* idle: percent of CPU used by any program
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> Every program or task that runs on a computer system occupies a certain amount of processing time on the CPU. If the CPU has completed all tasks it is idle.
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* nice: percent time occupied by user level processes with a positive nice value
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> The time the CPU has spent running users' processes that have been "niced"
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* irq: percent time spent servicing/handling hardware/software interrupts
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> Time servicing interrupts (hardware + software)
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* iowait: percent time spent in wait (on disk)
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> Time spent by the CPU waiting for a IO operations to complete
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* steal: percent time in involuntary wait by virtual CPU
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> Steal time is the percentage of time a virtual CPU waits for a real CPU while the hypervisor is servicing another virtual processor
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* ctx_sw: number of context switches (voluntary + involuntary) per second
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> A context switch is a procedure that a computer's CPU (central processing unit) follows to change from one task (or process) to another while ensuring that the tasks do not conflict
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* inter: number of interrupts per second
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* sw_inter: number of software interrupts per second. Always set to 0 on Windows and SunOS.
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* syscal: number of system calls per second. Do not displayed on Linux (always 0).
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To switch to per-CPU stats, just hit the ``1`` key:
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.. image:: ../_static/per-cpu.png
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By default, ``steal`` CPU time alerts aren't logged. If you want that,
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just add to the configuration file:
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.. code-block:: ini
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[cpu]
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steal_log=True
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Legend:
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================= ============
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CPU (user/system) 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 ``[cpu]`` and/or ``[percpu]`` sections.
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