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Hi Huang:

You can use the simple scheduler, allocates new instances to hosts that have the fewest instances currently running.

--scheduler_driver=nova.scheduler.simple.SimpleScheduler

More sophisticated schedulers are currently under active development, but they haven't made it to the trunk yet.

Take care,

Lorin
--
Lorin Hochstein, Computer Scientist
USC Information Sciences Institute
703.812.3710
http://www.east.isi.edu/~lorin

On May 23, 2011, at 10:00 PM, Huang Zhiteng wrote:

> Hi all,
> 
> In my setup of Cactus, I found Nova scheduler would place newly created instance to a compute node that is already full occupied (in terms of memory or # of virtual processors), which lead to swapping and VP overcommitting.  That would cause serious performance issue on a busy environment.  So I was wondering if there's some kinda mechanism to limit to resource one compute node could use, something like the 'weight' in OpenNebula. 
> 
> I'm using Cactus (with GridDynamic's RHEL package), default scheduler policy, one zone only.
> 
> Any suggestion?
> -- 
> Regards
> Huang Zhiteng
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