On Wed, 2015-01-28 at 22:48 +0530, murali reddy 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.
It's also worth pointing out that Python itself isn't all that parallelizable, even using the core threading packages. (See  for a write-up about the main block for multiple core utilization in Python, namely the GIL.) The upshot is that this is why some components like nova-api have the capability to fork; but the other components that use green threads are largely IO-bound, so threading based on IO call blocking makes sense there.  https://wiki.python.org/moin/GlobalInterpreterLock -- Kevin L. Mitchell <kevin.mitch...@rackspace.com> Rackspace __________________________________________________________________________ OpenStack Development Mailing List (not for usage questions) Unsubscribe: openstack-dev-requ...@lists.openstack.org?subject:unsubscribe http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev