Re: [Condor-users] RANK and job placement

[Michael Thomas <thomas@xxxxxxxxxxxxxxx>]

Hi Dan,

Dan Bradley wrote:
> Hi Michael,
> 
> Here's a configuration that I have found to be useful in an environment 
> similar to the one you describe:
> 
> NEGOTIATOR_PRE_JOB_RANK = 2 * (MY.RANK) + 1 * (RemoteOwner =?= UNDEFINED)

Does this only need to go in the config file for the negotiator, or
should it be defined on the schedd host as well?

> This will cause the negotiator to match the job preferentially to 
> machines that favor it and secondarily to choose idle machines over 
> occupied ones.

That sounds exactly like what I want.  Thanks!

--Mike

> Michael Thomas wrote:
>> I have a condor pool with ~250 batch slots available.  On half of the
>> batch slots I have set:
>>
>> RANK = (UserA =?= TRUE)
>>
>> ...and on the other half of the batch slots I have:
>>
>> RANK = (UserB =?= TRUE)
>>
>> This will allow both users to make use of free batch slots on the
>> cluster, while guaranteeing that each user has access to 50% of the
>> cluster resources.
>>
>> This has worked out pretty well for us so far.  But I've noticed some
>> interesting behavior that I was hoping someone could help me tune.
>> Occasionally I notice that UserA has ~20 jobs running, with the rest of
>> the batch slots empty.  These 20 jobs are scattered across slots where
>> the user has RANK priority and slots where the user does not have RANK
>> priority.  Next, UserB comes along and submits a bazillion jobs.  This
>> causes some of UserA's jobs to get evicted and restarted because some of
>> UserA's jobs are running on batch slots where UserB has rank priority.
>>
>> When UserA submitted his 20 jobs, why were they not directed to batch
>> slots where UserA had rank priority?  How can I get UserA's jobs to
>> prefer those batch slots while still allowing him opportunistic access
>> to the rest of the cluster?
>>
>> --Mike
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