[libvirt-users] No way to obtain guest's cpu and mem usage?

[Michal Privoznik]

On 12.04.2012 09:21, RaSca wrote:
> Hi everybody,
> I'm using the PHP API to make a web interface interact with the virtual
> machines installed on some hypervisor.
> Everything is fine, but I would like to find a way to get the guest's
> cpu and mem usage, so that it should be possible to make some rrd
> graphs. I didn't find out anything and also it seems looking around that
> there is no way to obtain those data.
> 
> What is strange for me is that programs like virt-top are showing
> exactly what I'm looking for. Can anyone help me to find out a way to
> retrieve those statistics?
> 
> Another related question: do you think I can obtain the same data by
> using this:
> 
> ps aux | egrep "[/]usr/libexec/qemu-kvm.*libvirt.*"  | awk '{print $3"/"$4}'
> 

This takes into account memory used by hypervisor itself.

Either you need to extend libvirt-php; or you can do:

$stats = exec("virsh dommemstat $dom");

However, I lean towards libvirt-php extension.

Michal