[one-users] Problems with scheduling VMs / Bug in Scheduler.cc

Niraj Tolia ntolia at gmail.com
Fri Feb 20 18:11:31 PST 2009

Hi Ruben,

OK. That makes sense. I believe I might have been doing something
wrong. Let me look into it.

On a related note, I discovered something that seems to be
inconsistent with the documentation at
http://www.opennebula.org/doku.php?id=documentation:rel1.4:ug . The
documentation states that you can say


However, that will fail with the following error

% onevm create <template>
Error: Error parsing VM template

Trying to replace that with REQUIREMENTS = 'FREECPU > 0.6' will lead
to this error in sched.log -- "[HOST][E]: Error evaluating expresion:
FREECPU > 0.6, error: syntax error, unexpected INTEGER, expecting $end
at line 1, columns 12:13"

The thing that does work is REQUIREMENTS = 'FREECPU > .6'


On Fri, Feb 20, 2009 at 5:46 PM, Ruben S. Montero <rubensm at dacya.ucm.es> wrote:
> Hi Niraj,
> The host->match() function sets the matched variable to true or false
> depending on the expression. The "rc" value returned by host->match() is used
> to check whether an error (i.e. syntax) is found while evaluating the
> expression. So rc==0 does not imply a matched resource.
> Could you send us the REQUIREMENTS that you are using, and the 'onehost show'
> output for a resource that you expect that would match.
> Cheers
> Ruben
> On Saturday 21 February 2009 02:37:23 Niraj Tolia wrote:
>> I have run into a couple of problem while evaluating OpenNebula and I
>> might have found a bug in Scheduler::match().
>> If you look at the code for the function match() in Scheduler.cc, the
>> variable 'matched' starts out uninitialized. Now, if reqs != "",
>> host->match() is called. However, even if the call to match is
>> successful, matched is never set to true and and therefore that host
>> is never checked for capacity. Simply setting match = true when rc ==0
>> seems to fix the problem I am seeing.
>> Please let me know if you need more details.
>> Cheers,
>> Niraj
>> _______________________________________________
>> Users mailing list
>> Users at lists.opennebula.org
>> http://lists.opennebula.org/listinfo.cgi/users-opennebula.org
> --
> +---------------------------------------------------------------+
>  Dr. Ruben Santiago Montero
>  Associate Professor
>  Distributed System Architecture Group (http://dsa-research.org)
>  URL:    http://dsa-research.org/doku.php?id=people:ruben
>  Weblog: http://blog.dsa-research.org/?author=7
>  GridWay, http://www.gridway.org
>  OpenNEbula, http://www.opennebula.org
> +---------------------------------------------------------------+

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