On Sun, Jan 17, 2010 at 5:02 AM, Daniel P. Berrange <berra...@redhat.com>wrote:
> On Fri, Jan 15, 2010 at 11:52:09AM -0800, su disheng wrote: > > Seem there is no way to get host CPU usage in libvirt API? I can get > > freeMemory by virNodeGetFreeMemory, but no cpu usage API. > > How about add a new api for it? The host CPU usage is also important for > VM > > creation and migration decision, like the free memory. > > Yes, I know, I can got it from "top"...:) > > We've historically thought that monitoring of the host OS is out of > scope of the libvirt API, since there are already a huge variety of > monitoring services / APIs available for people. I wonder if we need > to reconsider that now we have the VMWare drivers though - apps using > libvirt don't get to installl stuff in VMWare host OS, so the only > access to some of this host CPU data is probably via the VMWare APIs. > Which in turn suggests we'd need to expose some minimal hosting API > for this in libvirt > > Like this happened in the future, one APIs for both host and guest. Especially, for KVM, there is no much difference to get the both host and guest, cpu/disk/nic statistic data. > FWIW, virt-top/virt-manager calculates host CPU usage by summing the usage > of all guests over a fixed time slice. This will be an underestimate of > true host utilization though, since it can't see CPU usage for non-guest > related processes > For Xen like hypervisors, by summing the usage of all guests is OK, but for KVM, it's better to include other non-guest related processes. > Daniel > -- > |: Red Hat, Engineering, London -o- http://people.redhat.com/berrange/:| > |: http://libvirt.org -o- http://virt-manager.org -o- http://ovirt.org:| > |: http://autobuild.org -o- > http://search.cpan.org/~danberr/<http://search.cpan.org/%7Edanberr/>:| > |: GnuPG: 7D3B9505 -o- F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505 > :| >
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