** Changed in: nova
Status: In Progress => Fix Released
** Changed in: nova
Assignee: (unassigned) => Radoslav Gerganov (rgerganov)
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https://bugs.launchpad.net/bugs/1620692
Title:
Debug logging in scheduler kills performance
Status in OpenStack Compute (nova):
Fix Released
Bug description:
When using the filter_scheduler with 400 hosts (not a very large
number) and debug logging turned on, scheduling times start taking a
very long time. With debug logging on, select_destinations() can swing
anywhere between 3 and 18 seconds. With debug logging off,
select_destinations() takes 0-4 seconds
(http://paste.openstack.org/show/566153/).
The main problem is
https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L162-L178
because in a 400 host environment, it's trying to log debug 1600 times
on every instance boot.
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