On Nov 9, 2011, at 7:51 AM, Razique Mahroua wrote:
> I use the default scheduler, in fact, I've never tunned it really.
> The hypervisors all run KVM
This is where the flag is defined in nova.scheduler.least_cost.py:
32 FLAGS = flags.FLAGS
33 flags.DEFINE_list('least_cost_functions',
34 ['nova.scheduler.least_cost.compute_fill_first_cost_fn'],
35 'Which cost functions the LeastCostScheduler should use.')
Since the default weighting function is 'compute_fill_first_cost_fn',
which, as its name suggests, chooses hosts so as to fill up one host as much as
possible before selecting another, the pattern you're seeing is expected. If
you change that flag to 'nova.scheduler.noop_cost_fn', you should see the hosts
selected randomly. The idea is that you can create your own weighting functions
that will select potential hosts in a way that best fits your needs.
-- Ed Leafe
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