Hi, In https://github.com/openstack/nova/blob/master/nova/virt/hardware.py#L396 we calculated every possible CPU topologies and sorted by: # We want to # - Minimize threads (ie larger sockets * cores is best) # - Prefer sockets over cores possible = sorted(possible, reverse=True, key=lambda x: (x.sockets * x.cores, x.sockets, x.threads)) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20170620/d653b5b1/attachment.html>