Comment 21 for bug 1623394

today was unable to successfully upgrade from 9.0 to 9.1, so just some comparison for 9.0 against 10.0 resource usage:

MOS 10.0 smoke_neutron like environment:
               total used free shared buff/cache available
Mem: 2.9G 2.6G 118M 76M 276M 124M
Swap: 3.0G 2.9G 138M

   Memory and Swap usage per process:
   http://paste.openstack.org/show/583069/

MOS 9.0, smoke_neutron like environment, OSTF passed.

 before OSTF:
             total used free shared buffers cached
Mem: 2.9G 2.8G 176M 16M 5.2M 93M
-/+ buffers/cache: 2.7G 274M
Swap: 3.0G 1.5G 1.5G

during ostf:
             total used free shared buffers cached
Mem: 2.9G 2.8G 137M 8.8M 3.6M 73M
-/+ buffers/cache: 2.7G 214M
Swap: 3.0G 2.3G 751M

   Memory and Swap usage per process:
   http://paste.openstack.org/show/583070/

So currently from my POV - we need at least increase memory for Fuel slaves for all 10.0 jobs, as it looks like simply Openstack Newton eats a bit more memory than Mitaka