Re: [Condor-users] Per-slot rank expressions?

[Dan Bradley <dan@xxxxxxxxxxxx>]

Hi Ross,

The startd policy expressions cannot be specified on a per-slot basis.  
However, the power of the ClassAd language allows you to make one 
expression that acts differently on the different slots.

Example:

RANK = \
  ifThenElse( SlotID==1, $(SLOT1_RANK), \
  ifThenElse( SlotID==2, $(SLOT2_RANK), \
  0 ))

SLOT1_RANK = X
SLOT2_RANK = Y

Of course, this doesn't have to be done on a per-slot basis.  You could 
make ifThenElse() check some attribute other than SlotID.

--Dan

On 12/2/10 8:51 PM, Ross Oldenburg wrote:
> I considered using SLOT<N>_STARTD_ATTRS = (RANK = 1000), for example.
> But AFAIK, startd_attrs is only for custom classads.
>
> Ross Oldenburg wrote:
> > Hi,
> >
> > I have machines that use Hyperthreading.  I'd like to enable one slot
> > per thread.  However, I would like half of them to have a higher rank
> > than the rest to avoid putting work other than 'nice' jobs onto the
> > hyperthreads unless my pool is otherwise full.
> >
> > Examples of what I've tried:
> >
> > example1 {
> >
> > SLOT_TYPE_1 = cpu=1, mem=4096
> > NUM_SLOTS_TYPE_1 = 8
> > SLOT_TYPE_1_RANK = 10000
> >
> > SLOT_TYPE_2 = cpu=1, mem=1024
> > NUM_SLOTS_TYPE_2 = 8
> > SLOT_TYPE_2_RANK = 0
> >
> > }
> >
> > example2 {
> >
> > SLOT_TYPE_1 = cpu=1, mem=4096
> > NUM_SLOTS_TYPE_1 = 8
> >
> > SLOT_TYPE_2 = cpu=1, mem=1024
> > NUM_SLOTS_TYPE_2 = 8
> >
> > SLOT1_RANK = 10000
> > ...
> > SLOT8_RANK = 10000
> > SLOT9_RANK = 0
> > ...
> > SLOT16_RANK = 0
> >
> > }
> >
> > Neither of these worked.  When I view the machine ads, every slot
> > reports that its rank is 0.
> >
> > I did find a solution that did work, but I consider it a very bad hack...
> >
> > I run two condor_masters and two condor_startds, each with NUM_CPUS set
> > to |threads|/2 and with the appropriate RANK value.  One of the
> > master/startd sets has<SUBSYS>_NAME set to something unique.
> >
> > I would like to avoid this if it's possible and only run one master and
> > startd, but I can't find any hints on the condor wiki or in the manual
> > that indicate how this can be accomplished.  Any advice would be greatly
> > appreciated.
> >
> > Thanks much,
> > Ross Oldenburg
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