mirror of
https://github.com/nicolargo/glances.git
synced 2024-11-24 05:15:47 +03:00
94 lines
3.3 KiB
ReStructuredText
94 lines
3.3 KiB
ReStructuredText
.. _cpu:
|
|
|
|
CPU
|
|
===
|
|
|
|
The CPU stats are shown as a percentage or values 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. User CPU time is the time
|
|
spent on the processor running your program's code (or code in
|
|
libraries).
|
|
- **system**: percent time spent in kernel space. System CPU time is the
|
|
time spent running code in the Operating System kernel.
|
|
- **idle**: percent of CPU used by any program. 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.
|
|
- **nice** *(\*nix)*: percent time occupied by user level processes with
|
|
a positive nice value. The time the CPU has spent running users'
|
|
processes that have been *niced*.
|
|
- **irq** *(Linux, \*BSD)*: percent time spent servicing/handling
|
|
hardware/software interrupts. Time servicing interrupts (hardware +
|
|
software).
|
|
- **iowait** *(Linux)*: percent time spent by the CPU waiting for I/O
|
|
operations to complete.
|
|
- **steal** *(Linux)*: percentage of time a virtual CPU waits for a real
|
|
CPU while the hypervisor is servicing another virtual processor.
|
|
- **guest** *(Linux)*: percentage of time a virtual CPU spends
|
|
servicing another virtual CPU under the control of the Linux kernel.
|
|
- **ctx_sw**: number of context switches (voluntary + involuntary) per
|
|
second. 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.
|
|
- **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).
|
|
- **dpc**: *(Windows)*: time spent servicing deferred procedure calls.
|
|
|
|
To switch to per-CPU stats, just hit the ``1`` key:
|
|
|
|
.. image:: ../_static/per-cpu.png
|
|
|
|
In this case, Glances will show on line per logical CPU on the system.
|
|
If you have multiple core, it is possible to define the maximum number
|
|
of CPU to display. The top 'max_cpu_display' will be display and an
|
|
extra line with the mean of all others CPU will be added.
|
|
|
|
.. code-block:: ini
|
|
|
|
[percpu]
|
|
# Define the maximum number of CPU display at a time
|
|
# If the number of CPU is higher than:
|
|
# - display the top 'max_cpu_display' (sorted by CPU consumption)
|
|
# - a last line will be added with the sum of all other CPUs
|
|
max_cpu_display=4
|
|
|
|
Logical cores means the number of physical cores multiplied by the number
|
|
of threads that can run on each core (this is known as Hyper Threading).
|
|
|
|
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.
|