Virsh dommemstat
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
# 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
- Use
virsh dommemstatto view memory assigned to your VM orvirsh dominfo VM_MACHINE | grep memory
Related commands
See also
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