** Description changed:
Context: openstack juju/maas deploy using 1510 charms release
on trusty, with:
openstack-origin: "cloud:trusty-liberty"
source: "cloud:trusty-updates/liberty
* Several openstack nova- and neutron- services, at least:
nova-compute, neutron-server, nova-conductor,
neutron-openvswitch-agent,neutron-vpn-agent
show almost busy looping on epoll_wait() calls, with zero timeout set
most frequently.
- nova-compute (chose it b/cos single proc'd) strace and ltrace captures:
http://paste.ubuntu.com/13371248/ (ltrace, strace)
As comparison, this is how it looks on a kilo deploy:
- http://paste.ubuntu.com/13371635/
* 'top' sample from a nova-cloud-controller unit from
-this completely idle stack:
+ this completely idle stack:
http://paste.ubuntu.com/13371809/
FYI *not* seeing this behavior on keystone, glance, cinder,
ceilometer-api.
As this issue is present on several components, it likely comes
from common libraries (oslo concurrency?), fyi filed the bug to
nova itself as a starting point for debugging.
+
+ Note: The description in the following bug gives a good overview of the
+ issue and points to a possible fix for oslo.messaging:
+ https://bugs.launchpad.net/mos/+bug/1380220
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https://bugs.launchpad.net/bugs/1518430
Title:
liberty: ~busy loop on epoll_wait being called with zero timeout
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