[one-users] FREEMEMORY as RANK variable

[Steven C Timm]

During most of the time we have been running OpenNebula 2 and 3 we have been using a
rank based on FREEMEMORY.  We are now doing tests using OpenNebula 4.8, in a use case
where we are filling up an empty cloud.  FREEMEMORY still in theory should be an accurate value
but the problem is that 6-7 VM's are typically being launched on every SCHED cycle and so a
node that starts out with all of its memory free will end up full of virtual machines in a single cycle.

Once we got to a full cloud and steady-state it would be fine but when you have 8 VM's
starting at once on an old 8-core node, it takes much longer than it otherwise would.

Any cheap suggestions to get the default scheduler to do a more horizontal fill?

Steve Timm
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