CPU Questions

[adamb]

Hey all I have a few questions.

I currently have a KVM VM setup with the following specs

12vCPU
1000 cpu unit

I notice that the VM is running very hard, load is currently at 9. When looking at the host it doesn't seem to be breaking a sweat with a load of .2-.4. If I increase the cpu units of the VM should it help the situation. It seems the load of the VM should be reflected on the host.

I also verified that the load is coming from cpu usage. Disk usage is very minimal.

 

[adamb]

Also, is a restart of the VM needed for the new cpu units to take effect?

 

[adamb]

Set the value to 50000 in the GUI then rebooted the VM. Didn't seem to take effect. Still at 1000.

root@fiosprox1:/var/log# vzcpucheck -v
VEID CPUUNITS
-------------------------
0 1000
100 1000
Current CPU utilization: 2000
Power of the node: 4319600

 

[tom]

search the forum, e.g. http://forum.proxmox.com/threads/889-CPU-questions?p=4643#post4643

 

[adamb]

So I take it vzcpucheck is no good for KVM even though it represents 1000 for each VM?

Looking at ps -ef | grep kvm I see this "-cpuunits 50000"

Should be good. Machine seems to be running much better.

 

[mir]

search the forum, e.g. http://forum.proxmox.com/threads/889-CPU-questions?p=4643#post4643

According to the thread the cpu units available on a node is machine dependent. Is this still true? If it is true then this must be false: "Maximum value is 500000, minimal is 8". Or have I misunderstand something.

From one of my nodes:
vzcpucheck
Current CPU utilization: 4000
Power of the node: 813699

Second question: I guess the amount of cpu units assigned to a container is the guarantied minimum in that way that given free cpu units a container can be assigned more cpu units dynamically by the node?

 

[dietmar]

Also, is a restart of the VM needed for the new cpu units to take effect?

you need to stop completely, then start the VM (restart is not enough)

 

[udo]

Hey all I have a few questions.

I currently have a KVM VM setup with the following specs

12vCPU
1000 cpu unit

I notice that the VM is running very hard, load is currently at 9. When looking at the host it doesn't seem to be breaking a sweat with a load of .2-.4. If I increase the cpu units of the VM should it help the situation. It seems the load of the VM should be reflected on the host.

I also verified that the load is coming from cpu usage. Disk usage is very minimal.

Hi,
do you have 12 or more cores on the pve-server?
I have tried some time ago a VM with more vcpus than real cores which slow down the VM a lot!

Udo

 

[adamb]

Yep it is a 2 cpu package E5-2680

8 Cores
16 threads

So each node has 16 cores, and 32 threads.