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Re: [libvirt] libvirtd cpu usage



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


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