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Re: [libvirt] Unable to find node's mem and cpu api



Great!

I have Xen hypervisor. Can I can memory information from "domain 0" instance as well.  How to get physical utilization of each CPU attached  to host? I know this is being handled in virt-top but how?

- Jovial

On Mon, Sep 1, 2008 at 5:04 PM, Richard W.M. Jones <rjones redhat com> wrote:
On Mon, Sep 01, 2008 at 04:54:04PM +0200, jovialGuy _ wrote:
> I am unable to find the api in java and perl binding to find the host node's
> current memory and cpu information. Any body has any idea where I can find
> the information?

I'm not certain about whether the Java & Perl bindings support them,
but these are the calls you should use:

http://libvirt.org/html/libvirt-libvirt.html#virNodeGetInfo
http://libvirt.org/html/libvirt-libvirt.html#virNodeGetCellsFreeMemory
http://libvirt.org/html/libvirt-libvirt.html#virNodeGetFreeMemory

For CPU usage of the host, libvirt doesn't specifically provide that
information.  If the hypervisor is Xen, then you can get information
about CPU usage of Dom0 (usually what is meant by "the host") using:

http://libvirt.org/html/libvirt-libvirt.html#virDomainGetInfo

but that won't work for QEMU/KVM where "the host node" is just the
Linux kernel.  (In the local case, you can extract that information
you need just by looking in /proc or using ordinary Linux tools).

Also read this: http://et.redhat.com/~rjones/virt-top/faq.html#calccpu

Rich.

--
Richard Jones, Emerging Technologies, Red Hat  http://et.redhat.com/~rjones
virt-top
is 'top' for virtual machines.  Tiny program with many
powerful monitoring features, net stats, disk stats, logging, etc.
http://et.redhat.com/~rjones/virt-top


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