Linux CPU Info: Difference between revisions
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=Internal= | =Internal= | ||
* [[Linux#Getting_Runtime_Information]] | * [[Linux#Getting_Runtime_Information|Linux Runtime Information]] | ||
* https://home.feodorov.com:9443/wiki/Wiki.jsp?page=LinuxProcessInformation | * https://home.feodorov.com:9443/wiki/Wiki.jsp?page=LinuxProcessInformation | ||
* https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo | * https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo | ||
= | =System-Wide CPU Runtime Statistics= | ||
<span id="CPU_Runtime_Statistics"></span>CPU runtime statistics are computed based on [[/proc/stat]] values. | |||
User time: [[Vmstat#us|vmstat us]] | |||
Kernel time: [[Vmstat#sy|vmstat sy]] | |||
Idle time: [[Vmstat#id|vmstat id]] | |||
Time waiting for IO: [[Vmstat#wa|vmstat wa]] | |||
Steal time: [[Vmstat#st|vmstat st]]. The definition of "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= | ||
[[top]] | |||
[[vmstat]] | |||
lscpu | |||
=proc cpuinfo= | =proc cpuinfo= | ||
| Line 42: | Line 38: | ||
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?= | |||
<pre> | |||
uname -a | |||
</pre> | |||
<pre> | |||
grep flags /proc/cpuinfo | |||
</pre> | |||
==lm== | |||
long mode - 64 bits | |||
==protected mode== | |||
32 bits | |||
Latest revision as of 22:35, 1 March 2018
Internal
- Linux Runtime Information
- https://home.feodorov.com:9443/wiki/Wiki.jsp?page=LinuxProcessInformation
- https://home.feodorov.com:9443/wiki/Wiki.jsp?page=Cpuinfo
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":
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
64 bit or 32 bit?
uname -a
grep flags /proc/cpuinfo
lm
long mode - 64 bits
protected mode
32 bits