Linux CPU Info: Difference between revisions

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* https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo
* https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo


=CPU Runtime Statistics=
=System-Wide CPU Runtime Statistics=


CPU runtime statistics are computed based on <tt>/proc/stat</tt> values.
<span id="CPU_Runtime_Statistics"></span>CPU runtime statistics are computed based on [[/proc/stat]] values.


User time: [[Vmstat#us|vmstat us]]
User time: [[Vmstat#us|vmstat us]]
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{{Internal|Linux Virtualization Concepts#Steal_Time|Steal Time}}
{{Internal|Linux Virtualization Concepts#Steal_Time|Steal Time}}
=Per-Process CPU Runtime Statistics=
{{Internal|Linux Per-Process CPU Runtime Statistics|Per-Process CPU Runtime Statistics}}


=Other Utilities=
=Other Utilities=


<blockquote style="background-color: #f9f9f9; border: solid thin lightgrey;">
[[top]]
:[[top]]
[[vmstat]]
:[[vmstat]]
lscpu
</blockquote>


=proc cpuinfo=
=proc cpuinfo=
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For more details see https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo.
For more details see https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo.
=Virtualization Extensions=
To verify that a processor has its virtualization extensions enabled, run:
<pre>
grep -E "vmx|svm" /proc/cpuinfo
</pre>
If the command generates output, it means the virtualization extensions are enabled.
More details {{External|[https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Virtualization_Deployment_and_Administration_Guide/sect-Troubleshooting-Enabling_Intel_VT_x_and_AMD_V_virtualization_hardware_extensions_in_BIOS.html RHEL 7 Virtualization Administration Guide - Enabling Intel VT-x and AMD-V Virtualization Extensions in BIOS]}}


=64 bit or 32 bit?=
=64 bit or 32 bit?=

Latest revision as of 22:35, 1 March 2018

Internal

System-Wide CPU Runtime Statistics

CPU runtime statistics are computed based on /proc/stat values.

User time: vmstat us

Kernel time: vmstat sy

Idle time: vmstat id

Time waiting for IO: vmstat wa

Steal time: vmstat st. The definition of "steal time":

Steal Time

Per-Process CPU Runtime Statistics

Per-Process CPU Runtime Statistics

Other Utilities

top
vmstat
lscpu

proc cpuinfo

cat /proc/cpuinfo 

For more details see https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo.

Virtualization Extensions

To verify that a processor has its virtualization extensions enabled, run:

grep -E "vmx|svm" /proc/cpuinfo

If the command generates output, it means the virtualization extensions are enabled.

More details

RHEL 7 Virtualization Administration Guide - Enabling Intel VT-x and AMD-V Virtualization Extensions in BIOS

64 bit or 32 bit?

uname -a
grep flags /proc/cpuinfo

lm

long mode - 64 bits

protected mode

32 bits