Re: [Condor-users] partitionable slots are not returned?

["Joan J. Piles" <jpiles@xxxxxxxxx>]

Hello all:

We are having the same problem.

In your case (very much like ours), the problem is that the =?= operator 
evaluates to FALSE if the operand is not defined [1]. As there is no 
longer any job in the slot, it follows that Target.Owner =?= whatever 
will always evaluate to false, thus causing the slot to get "stuck" in 
the Owner state forever [2].

What we have done is to use any expression that evaluates to TRUE when 
there are no jobs executing (for instance, Target.Owner =?= UNDEFINED). 
Thus your requirement should be:

START = (Target.Owner =?= UNDEFINED) || ( Target.Owner =?= "testuser" )

Hope this works, and would be useful to have documented.

Cheers,

Joan

[1] 
http://www.cs.wisc.edu/condor/manual/v7.4/4_1Condor_s_ClassAd.html#SECTION00512300000000000000
[2] 
http://www.cs.wisc.edu/condor/manual/v7.4/3_5Policy_Configuration.html#SECTION00455000000000000000

El 29/03/11 13:28, Matthew Farrellee escribió:
> On 03/29/2011 07:18 AM, Carsten Aulbert wrote:
> > Hi all
> >
> > On Monday 28 March 2011 14:51:03 Carsten Aulbert wrote:
> > > On Monday 28 March 2011 14:10:14 Matthew Farrellee wrote:
> > > > I would guess that your START is preventing the slot from handling any
> > > > jobs or going back to the Unclaimed state. When a dynamic slot hits
> > > > Unclaimed it gets folded back into the partitionable slot.
> > > condor_config_val -dump gpu016.atlas.local | grep '^START ='
> > > START = ( Target.Owner =?= "testuser" )
> > >
> > > Does this prevent it going back to unclaimed?
> >
> > I fear you are right, putting START=TRUE will "recycle" previoulsy used
> > dynamic slots.
> >
> > I wonder if there is a way to both have a more complex START 
> > expression as
> > well as having recycling. But for that I would need to understand 
> > *why* this
> > evaluates to false, *after* a job is gone, is there a default owner or
> > something else in order to make the START expression true again?
> >
> > Any pointers?
> >
> > Cheers
> >
> > Carsten
>
> That is puzzling. I'd suggest wrapping your START with debug(), e.g. 
> START = debug(Target.Owner =?= "testuser"), and have a look at what's 
> being evaluated to cause START == False.
>
> Best,
>
>
> matt
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Joan Josep Piles Contreras -  Analista de sistemas
I3A - Instituto de Investigación en Ingeniería de Aragón
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