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Revision c3c7a0c1

IDc3c7a0c123ac9a95e4292b1beee92129320fa14f

Added by Iustin Pop over 13 years ago

Change the meaning of the N+1 fail metric

Currently, this metric tracks the nodes failing the N+1 check. While
this helps (in some cases) to evacuate such nodes, it's not a good
metric since rarely it will change during a step (only at the last
instance moving away). Therefore we replace it with the count of
instances living on such nodes, which is much better because:
- moving an instance away while the node is still N+1 failing will still
reflect in the score as an optimization
- moving the last instance causing an N+1 failure will result in a heavy
decrease of this score, thus giving the right bonus to clear this
status

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