libvirt users - Apr 2012 - No way to obtain guest's cpu and mem usage?

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}'

on the hypervisor? These are related to the kvm process, and the kvm
process IS the virtual machine... Or not?

Thanks to everybody,

-- 
RaSca
Mia Mamma Usa Linux: Niente ? impossibile da capire, se lo spieghi bene!
rasca at miamammausalinux.org
http://www.miamammausalinux.org

On Thu, Apr 12, 2012 at 09:21:18AM +0200, 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?
virt-top mostly uses the virDomainGetInfo()  API to get this data.

Regards,
Daniel
-- 
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|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
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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