[libvirt] libvirtd cpu usage

[Thomas Mueller]

hi daniel


>> i'm playing on debian lenny with kvm-66/libvirt-0.4.2 .
>>
>> if i run top, i see libvirtd is top cpu consumer. if i connect with 
>> strace to libvirtd, i see a thousand times this message:
>>
>> poll([{fd=3, events=POLLIN}, {fd=6, events=POLLIN|POLLERR|POLLHUP}, 
>> {fd=7, events=POLLIN|POLLERR|POLLHUP}, {fd=8, events=POLLIN}, {fd=13, 
>> events=POLLIN|POLLERR|POLLHUP, revents=POLLHUP}, {fd=15, 
>> events=POLLIN|POLLERR|POLLHUP, revents=POLLHUP}, {fd=17, 
>> events=POLLIN|POLLERR|POLLHUP}, {fd=19, events=POLLIN|POLLERR|POLLHUP}], 
>> 8, -1) = 2
> 
> So this is saying 2 of file descriptors have hit 'end of file' condition
> and for some bizarre reason libvirt is not cleaning them up. What do you
> do to cause trigger the high CPU usage ?  Does it occurr the moment you
> start libvirtd ? Or only when you start a VM ? Or only when you shutdown
> a VM ? Or something else altogether...
> 
> The output of 'lsof -p'  on the libvirtd process might be helpful. You
> might also try running  with --verbose and LIBVIRT_DEBUG=1 envirnoment
> variable set and capturing the output

hmm.. ok, i can't reproduce it anymore. :/ but i found a second libvirtd 
process in defunct state. maybe this was the cause for this "bizzare 
reason libvirt not cleaning them up".

after rebooting i tested again and libvirtd was not consuming all of the 
cpu...

sorry for disturbing.

- Thomas