openstack team mailing list archive

[Joseph Suh <jsuh@xxxxxxx>]

Huang,

If you are willing to modify code, you might want to take a look at the code at lp:~usc-isi/nova/hpc-trunk that has a scheduler (nova/scheduler/arch.py) that does not allow creating new instances if cpu or other resources are used up. If you have any question on the branch, please feel free to ask me.

Thanks,

Joseph

----- Original Message -----
From: "Lorin Hochstein" <lorin@xxxxxxx>
To: "Huang Zhiteng" <winston.d@xxxxxxxxx>
Cc: openstack@xxxxxxxxxxxxxxxxxxx
Sent: Monday, May 23, 2011 11:00:22 PM
Subject: Re: [Openstack] How to limit the total virtual processors/memory	for one compute node?


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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