[nova][ironic] Lock-related performance issue with update_resources periodic job

Jason Anderson jasonanderson at uchicago.edu
Mon May 13 20:14:09 UTC 2019

Hi Eric, thanks, that's very useful reading. I suspect the root issue is the same, as this isn't specific to Ironic per se, but rather is linked to a high # of hypervisors managed by one compute service. In our case, Placement was able to keep up just fine (though raising this job interval also lowered the number of requests to Placement significantly.) My suspicion was that it was less about load on Placement, and more about this lock contention. I will have to try pulling in these patches to test that.

From: Eric Fried <openstack at fried.cc>
Sent: Monday, May 13, 2019 14:54
To: openstack-discuss at lists.openstack.org
Subject: Re: [nova][ironic] Lock-related performance issue with update_resources periodic job


You may find this article interesting [1]. It isn't clear whether your
issue is the same as CERN's. But it would be interesting to know whether
setting [compute]resource_provider_association_refresh [2] to a very
large number (while leaving your periodic interval at its default) also
mitigates the issue.


[1] https://techblog.web.cern.ch/techblog/post/placement-requests/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openstack.org/pipermail/openstack-discuss/attachments/20190513/cbf961a6/attachment.html>

More information about the openstack-discuss mailing list