Difference between revisions of "Virsh dommemstat"

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Get memory stats for a running domain.<ref>
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{{lc}}<code>[[virsh]] dommemstat</code> get [[memory]] stats for a running domain/VM.
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https://en.wikiversity.org/wiki/Draft:Virsh/virsh_dommemstat</ref>
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* Doc: https://libvirt.org/sources/virshcmdref/html-single/#sect-dommemstat
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<code>dommemstat domain [--period seconds] [[--config] [--live] | [--current]]</code><ref>https://rentry.co/bmpsn</ref>
 
  
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Availability of these fields depends on hypervisor. Unsupported fields are missing from the output. Other fields may appear if communicating with a newer version of libvirtd.
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Syntax:
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* <code>[[virsh]] dommemstat DOMAIN_NAME [--period seconds] [[--config] [--live] | [--current]]</code><ref>https://rentry.co/bmpsn</ref>
  
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For QEMU/KVM with a memory balloon, setting the optional --period to a value larger than 0 in seconds will allow the balloon driver to return additional statistics which will be displayed by subsequent <code>dommemstat</code> commands. Setting the <code>--period</code> to 0 will stop the balloon driver collection, but does not clear the statistics in the balloon driver. Requires at least [[QEMU]]/[[KVM]] 1.5 to be running on the host.
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Example:
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# virsh dommemstat YOUR_VM_NAME         
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actual 1048576         
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[[swap_in]] 0             
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swap_out 0           
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[[major_fault]] 913       
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[[minor_fault]] 247449   
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unused 694704         
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available 1014852     
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usable 732936         
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last_update 1514452854 
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[[rss]] 537524           
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Availability of these fields depends on [[hypervisor]]. Unsupported fields are missing from the output. Other fields may appear if communicating with a newer version of <code>[[libvirtd]]</code>.
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For [[QEMU]]/[[KVM]] with a [[memory balloon]], setting the optional <code>--period</code> to a value larger than 0 in seconds will allow the balloon driver to return additional statistics which will be displayed by subsequent <code>dommemstat</code> commands. Setting the <code>--period</code> to 0 will stop the balloon driver collection, but does not clear the statistics in the balloon driver. Requires at least [[QEMU]]/[[KVM]] 1.5 to be running on the host.
  
 
The <code>--live</code>, <code>--config</code>, and <code>--current</code> flags are only valid when using the <code>--period</code> option in order to set the collection period for the balloon driver. If <code>--live</code> is specified, only the running guest collection period is affected. If <code>--config</code> is specified, affect the next boot of a persistent guest. If <code>--current</code> is specified, affect the current guest state.
 
The <code>--live</code>, <code>--config</code>, and <code>--current</code> flags are only valid when using the <code>--period</code> option in order to set the collection period for the balloon driver. If <code>--live</code> is specified, only the running guest collection period is affected. If <code>--config</code> is specified, affect the next boot of a persistent guest. If <code>--current</code> is specified, affect the current guest state.
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Both <code>--live</code> and <code>--config</code> flags may be given, but <code>--current</code> is exclusive. If no flag is specified, behavior is different depending on the guest state.
 
Both <code>--live</code> and <code>--config</code> flags may be given, but <code>--current</code> is exclusive. If no flag is specified, behavior is different depending on the guest state.
  
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Command:
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== Examples ==
 
<pre>
 
<pre>
 
# virsh dommemstat YOUR_VM_NAME           
 
# virsh dommemstat YOUR_VM_NAME           
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== Activities ==
 
== Activities ==
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# Use <code>virsh dommemstat</code> to view memory assigned to your VM or <code>virsh dominfo VM_MACHINE | grep memory</code>
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# Use <code>virsh dommemstat</code> to view memory assigned to your VM or <code>[[virsh dominfo]] VM_MACHINE | grep memory</code>
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== Related commands ==
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* <code>[[virsh domstats]]</code>
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* <code>[[virsh dominfo]]</code>
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* [[virsh domstats --memory]] ([[Libvirt release notes|Added in v6.0.0 (2020-01-15)]])
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* [[Virt-top]]
  
 
== See also ==
 
== See also ==
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* [[Virsh Memory Commands]]:  [[virsh dommemstat]], [[virsh setmem]]
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* {{virsh memory commands}}
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*[[KVM]]
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* {{KVM}}
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[[Category:Linux]]
 
[[Category:Linux]]
 
[[Category:KVM]]
 
[[Category:KVM]]

Latest revision as of 09:16, 17 January 2024

virsh dommemstat get memory stats for a running domain/VM.

Syntax:

  • virsh dommemstat DOMAIN_NAME [--period seconds] [[--config] [--live] | [--current]][1]

Example: 

# virsh dommemstat YOUR_VM_NAME          
actual 1048576          
swap_in 0               
swap_out 0             
major_fault 913         
minor_fault 247449    
unused 694704          
available 1014852       
usable 732936          
last_update 1514452854  
rss 537524

Availability of these fields depends on hypervisor. Unsupported fields are missing from the output. Other fields may appear if communicating with a newer version of libvirtd.

For QEMU/KVM with a memory balloon, setting the optional --period to a value larger than 0 in seconds will allow the balloon driver to return additional statistics which will be displayed by subsequent dommemstat commands. Setting the --period to 0 will stop the balloon driver collection, but does not clear the statistics in the balloon driver. Requires at least QEMU/KVM 1.5 to be running on the host.

The --live, --config, and --current flags are only valid when using the --period option in order to set the collection period for the balloon driver. If --live is specified, only the running guest collection period is affected. If --config is specified, affect the next boot of a persistent guest. If --current is specified, affect the current guest state.

Both --live and --config flags may be given, but --current is exclusive. If no flag is specified, behavior is different depending on the guest state.

Examples[edit]

# virsh dommemstat YOUR_VM_NAME          
actual 1048576          
swap_in 0               
swap_out 0             
major_fault 913         
minor_fault 247449    
unused 694704          
available 1014852       
usable 732936          
last_update 1514452854  
rss 537524

Output explained: 

# virsh dommemstat YOUR_VM_NAME          
actual 1048576          # Current balloon value (in KB)
swap_in 0               # The amount of data read from swap space (in kB)
swap_out 0              # The amount of memory written out to swap space (in kB)
major_fault 913         # The number of page faults where disk IO was required
minor_fault 247449      # The number of other page faults
unused 694704           # The amount of memory left unused by the system (in kB)
available 1014852       # The amount of usable memory as seen by the domain (in kB)
usable 732936           # The amount of memory which can be reclaimed by balloon without causing host swapping (in KB) *
last_update 1514452854  # Timestamp of the last update of statistics (in seconds)
rss 537524              # Resident Set Size of the running domain's process (in kB)


Activities[edit]

  1. Use virsh dommemstat to view memory assigned to your VM or virsh dominfo VM_MACHINE | grep memory


Related commands[edit]

See also[edit]

  • ↑ https://rentry.co/bmpsn
    • Retrieved from "https://www.wikieduonline.com/index.php?title=Virsh_dommemstat&oldid=289635"

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