[openstack-dev] design question : green thread model

Belmiro Moreira moreira.belmiro.email.lists at gmail.com
Thu Jan 29 22:01:41 UTC 2015

nova-conductor starts multiple processes as well.


On Wednesday, January 28, 2015, Johannes Erdfelt <johannes at erdfelt.com>

> On Wed, Jan 28, 2015, murali reddy <muralimmreddy at gmail.com <javascript:;>>
> wrote:
> > On hosts with multi-core processors, it does not seem optimal to run a
> > single service instance with just green thread. I understand that on
> > controller node, we can run one or more nova services but still it does
> not
> > seem to utilize multi-core processors.
> >
> > Is it not a nova scaling concern?
> It certainly depends on the service.
> nova-compute isn't CPU limited for instance, so utilizing multiple cores
> isn't necessary.
> nova-scheduler generally isn't CPU limited either in our usage (at
> Rackspace), but we use cells and as a result, we run multiple independent
> nova-scheduler services.
> If you've seen some scaling problems, I know the Nova team is open to
> reports. In some cases, patches wouldn't be hard to develop to start
> multiple processes, but no one has ever reported a need beyond nova-api.
> JE
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