[openstack-dev] [Openstack][Nova] Slow Nova API Calls from periodic-tempest-devstack-vm-check-hourly

Michael Still mikal at stillhq.com
Mon Jan 7 07:02:31 UTC 2013

On Mon, Jan 7, 2013 at 5:46 PM, Mark McLoughlin <markmc at redhat.com> wrote:
> On Fri, 2013-01-04 at 11:58 -0800, Joe Gordon wrote:
>> Conclusion
>> =========
>> Nova REST calls take way long, even in small scale devstack/tempest
>> testing.  We should spend resources on fixing this for Grizzly.  I would
>> like to start a dialog on how we can fix this and see if anyone wants to
>> volunteer help.  Below are a few possible ideas of things that will help us
>> make the REST calls faster.

> Summary is we're randomly seeing a multi-second delay in nova-api
> between the time a HTTP request is received and we send an AMQP message?

We've also seem stuff like this before if there's lock contention.
Perhaps something is holding a lock which the API needs?

https://review.openstack.org/#/c/14804/ would help with debugging if
its a locking problem involving RPCs (but would need some more work).


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