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90 lines
3.2 KiB
ReStructuredText
90 lines
3.2 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 values and for the configured
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refresh time.
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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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A character is also displayed just after the CPU 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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``-`` CPU value is equal to the mean of the six latests refreshes
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``\`` CPU value is lower than the mean of the six latests refreshes
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``/`` CPU value is higher than the mean of the six latests refreshes
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======== ==============================================================
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CPU stats description:
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- **user**: percent time spent in user space. User CPU time is the time
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spent on the processor running your program's code (or code in
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libraries).
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- **system**: percent time spent in kernel space. System CPU time is the
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time spent running code in the Operating System kernel.
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- **idle**: percent of CPU used by any program. Every program or task
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that runs on a computer system occupies a certain amount of processing
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time on the CPU. If the CPU has completed all tasks it is idle.
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- **nice** *(\*nix)*: percent time occupied by user level processes with
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a positive nice value. The time the CPU has spent running users'
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processes that have been *niced*.
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- **irq** *(Linux, \*BSD)*: percent time spent servicing/handling
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hardware/software interrupts. Time servicing interrupts (hardware +
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software).
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- **iowait** *(Linux)*: percent time spent by the CPU waiting for I/O
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operations to complete.
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- **steal** *(Linux)*: percentage of time a virtual CPU waits for a real
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CPU while the hypervisor is servicing another virtual processor.
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- **ctx_sw**: number of context switches (voluntary + involuntary) per
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second. A context switch is a procedure that a computer's CPU (central
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processing unit) follows to change from one task (or process) to
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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
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0 on Windows and SunOS.
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- **syscal**: number of system calls per second. Do not displayed on
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Linux (always 0).
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- **dpc**: *(Windows)*: time spent servicing deferred procedure calls.
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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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In this case, Glances will show on line per logical CPU on the system.
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Logical cores means the number of physical cores multiplied by the number
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of threads that can run on each core (this is known as Hyper Threading).
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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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