[SOLVED] Solutions for Consistently High CPU Usage

[mrnim94]

Hi team Proxmox,
I have physical Server with 16-core/32-thread . I create 4 VMs and per VM provided 32 vCPU.

case 1: When only VM running and using 100% vCPU, how physical server use the CPU?

case 2: if all VMs running and using 100% vCPU, how physical server use the CPU?

Do proxmox have overcommit CPU ?

Thanks all.

 

[wolfgang]

Hi,

the recommended max VCPU per Guest is N(is Host core count) -1.
If you use all you produce unnecessary interrupts what is, in the end, slower than -1 core.
To both of your cases: The interrupt increase what slows you system down.

Do proxmox have overcommit CPU ?

Yes

 

[DANILO MONTAGNA]

Interesting question..

How many vCPU slots can we power on simultaneous for VM guest in terms of overcommit?

 

[wolfgang]

How many vCPU slots can we power on simultaneous for VM guest in terms of overcommit?

There is no ratio because of this dependence on the workload and some other factors.