I have 5 compute nodes. When I deploy instances, the most of the instances automatically placed in node 1 or node 2. The other compute nodes remain empty or with one or two instances on it.

I have enabled the above filters. How to ensure that instances should be scheduled on compute nodes evenly on all compute hosts based on RAM only ? Like scheduler should schedule the instance on compute host which has a large amount of RAM available then other hosts.  
- Ammad