Re: [Condor-users] RANK from the "machine" point of view

[Dan Bradley <dan@xxxxxxxxxxxx>]

The config file expressions NEGOTIATOR_PRE_JOB_RANK and 
NEGOTIATOR_POST_JOB_RANK allow you to steer jobs to the machines you 
prefer.  When jobs are being matched to machines, the "pre job rank" is 
the first order rank expression, so whatever you put there will always 
be honored above all else.  If that expression produces a tie in the 
rank between several machines, the user's rank expression (specified in 
the submit file) is applied next.  If there is still a tie, the "post 
job rank" is applied next.  Therefore, you can control whether your 
default preferences are applied with higher or lower precedence than 
the user's.

Example:

NEGOTIATOR_POST_JOB_RANK = KFlops/10000 + Memory

You may need to play around with the relative magnitude of the various 
terms in a rank expression to get the effect you want, given the 
machines that exist in your Condor pool.  Or, as in your example below, 
you can simply rely on discrete attributes such as the machine name or 
other attributes that you configure in the machine ClassAds to 
advertise the what class of machine they are.  Example:

NEGOTIATOR_POST_JOB_RANK = \
  1 * (Machine == "pc7.domain.name" || Machine == "pc8.domain.name") + \
  2 * (Machine == "pc4.domain.name" || ...) + \
  3 * (Machine == "pc1.domain.name" || ...)


--Dan

On Dec 27, 2005, at 10:10 AM, Nicolas GUIOT wrote:

> Hi,
>
> I'm a bit confused with the ranking scheme used in condor :
>
> I have about 20 machines, quite different in CPU speed and RAM, and 
> not always 100% used :
> I would like to automatically add (i.e. : not the users have to deal 
> with it, unless specified by themselves)something like :
>
> big_cpu="PC1, PC2, PC3"
> mid_cpu="PC4, PC5, PC6"
> small_cpu="PC7, PC8, PC9"
>
> use big_cpu if available, else mid_cpu if available, else small_cpu
>
> Should I trick the global condor_config file ? or elseway ?
>
> Thanks
>
> Nicolas
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