How to work cpu dedicate on Virsh
Reza Bojnordi
Site Reliability Engineer & System Engineer @ BCW Group | Solutions Architect & Cloud Operations
To work with CPU dedications on virsh, you can use the virsh schedinfo command to view and modify the CPU scheduling parameters for a virtual machine instance. Here are the steps to work with CPU dedications on virsh:
virsh
2. Connect to the hypervisor that hosts the virtual machine instance you want to work with. For example, if the instance is hosted on the qemu:///system hypervisor, you can connect to it by running the following command:
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connect qemu:///system
3. View the current CPU scheduling parameters for the virtual machine instance by running the following command:
virsh schedinfo instance-name
Replace instance-name with the name of the virtual machine instance you want to work with. The output of this command will show the current CPU scheduling parameters for the instance.
4. Modify the CPU scheduling parameters to enable CPU dedications. You can do this by setting the vcpu_period and vcpu_quota parameters to specific values. The vcpu_period parameter sets the time period in microseconds for which the CPU is allocated to the instance, and the vcpu_quota parameter sets the number of microseconds of CPU time allocated to the instance during each period. For example, to allocate one CPU core exclusively to the virtual machine instance, you can set the vcpu_period parameter to 1000000 (1 second) and the vcpu_quota parameter to 1000000 (1 second).
virsh schedinfo instance-name --set vcpu_period=1000000 vcpu_quota=1000000
5. Verify that the CPU dedications are working by monitoring the CPU usage of the virtual machine instance using the virsh cpu-stats command. You should see that the virtual machine instance is using all the CPU resources allocated to it by the vcpu_quota parameter.
By following these steps, you can use the virsh command line tool to work with CPU dedications on a virtual machine instance running on a hypervisor.