9:54 a.m.
hey,
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?
- Jovial
10:04 a.m.
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
10:26 a.m.
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(a)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<http://et.redha...
Rich.
--
Richard Jones, Emerging Technologies, Red Hat
http://et.redhat.com/~rjones
virt-top <http://et.redhat.com/%7Erjonesvirt-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<http://et.redhat.com/%7Erjones/v...
10:41 a.m.
On Mon, Sep 01, 2008 at 05:26:28PM +0200, jovialGuy _ wrote:
I have Xen hypervisor. Can I can memory information from "domain
0" instance
as well.
Yes, although because of the Xen model where dom0 is just a special
guest, the amount of memory used by dom0 isn't indicative of the
amount of memory available for new guests. Only the hypervisor knows
that, and we don't expose it through libvirt [1].
How to get physical utilization of each CPU attached to host? I
know this is being handled in virt-top but how?
It's really really complicated. I could explain it here, but that
would amount to an imprecise description of what is precisely
described in the virt-top code itself. So you're better off just
going and reading that code to find out how to do it.
http://hg.et.redhat.com/virt/applications/virt-top--devel/?f=ab5dd3923798...
lines 595--678.
See also the virt-top FAQ:
http://et.redhat.com/~rjones/virt-top/faq.html
Rich.
[1] AFAIK -- perhaps we do through the NUMA calls?
--
Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones
Read my OCaml programming blog: http://camltastic.blogspot.com/
Fedora now supports 64 OCaml packages (the OPEN alternative to F#)
http://cocan.org/getting_started_with_ocaml_on_red_hat_and_fedora
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Richard W.M. Jones