Script to monitor and limit CPU usage on resource intensive VMs

[harmonyp]

I am seeking out a monitoring script that would limit VMs that are using too much CPU usage over a long period of time.

Example

VM1 (4vCPU 2 core/2thread) uses 80%+ CPU (of total cores allocated) for 24 hours, gets 50% reduction down from 4 vCPU to 2 via CPU Limit

After 6 hours of the CPU no longer being at 80%+ usage the full 4vCPU are restored

Are there any monitoring tools like this? I am unable to find anything on Github

 

[ph0x]

I don't have an answer that is backed by thorough knowledge but as far as I know, cpu cores can only be changed upon reboot.

You could try to change the niceness of the respective qm/kvm process on host level, though, so that other processes get a higher priority.

 

[harmonyp]

I don't have an answer that is backed by thorough knowledge but as far as I know, cpu cores can only be changed upon reboot.

You could try to change the niceness of the respective qm/kvm process on host level, though, so that other processes get a higher priority.

"CPU limit" in this screenshot can be changed without a reboot

 

[ph0x]

Hm, with my hardware the cpu core count is printed in orange until it becomes black with the next reboot ...

 

[Ciprian Tomoiaga]

@ph0x by default there is no CPU hotplug, but you can configure it : https://pve.proxmox.com/wiki/Hotplug_(qemu_disk,nic,cpu,memory)

Then, you need to give the max Sockets and Cores to each VM, and just adjust the VCPUs, which are the ones the VM sees. I've tested this and it can really be hotplug