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From Michael Stroucken <>
Subject Re: primitive scheduler question
Date Mon, 04 Apr 2011 15:29:57 GMT
Kozuch, Michael A wrote:
> Michael,
> Meant to respond to this a while ago...  I vote "yes".  It would seem unfortunate if
VMs were not created when free space is available to a user.
> The way I think about this scheduling issue is-- suppose that a user issues a vmCreate
command when (a) there is free space in the cluster and (b) there is free space on nodes reserved
for the user, should the scheduler consume the reserved space first, last, or in some other
order?  The current policy, which I believe will not schedule to reserved capacity at all
without explicit placement, seems less rational than "last".
Very true.

> My gut feel is that schedulers ought to either schedule to the reserved capacity first
or ought to consider all free space, including the requestor's reserved space, when making
a placement decision.
Since we're talking about the primitive scheduler here, I feel fine 
filling from the user's reservation first without much more intelligence 
to go into the decision.


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