On 10/09/2015 11:09 AM, Zane Bitter wrote:
The optimal way to do this would be a weighted random selection, where the
probability of any given host being selected is proportional to its weighting.
(Obviously this is limited by the accuracy of the weighting function in
expressing your actual preferences - and it's at least conceivable that this
could vary with the number of schedulers running.)
In fact, the choice of the name 'weighting' would normally imply that it's done
this way; hearing that the 'weighting' is actually used as a 'score' with the
highest one always winning is quite surprising.
If you've only got one scheduler, there's no need to get fancy, you just pick
the "best" host based on your weighing function.
It's only when you've got parallel schedulers that things get tricky.
Chris
__________________________________________________________________________
OpenStack Development Mailing List (not for usage questions)
Unsubscribe: [email protected]?subject:unsubscribe
http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
