Re: [Condor-users] How to slip in later-submitted jobs

[Dan Bradley <dan@xxxxxxxxxxxx>]

Finch, Ralph wrote:
> Questions:
>
> 1.  Will Condor now, without any further condor_config editing, give
> Sally's jobs equal priority with Joe's jobs in competition for newly
> available machines?
>   

All other things being equal, Condor will try to give Sally and Joe an 
equal share of the pool, so if new resources become available, Sally 
should get them.
> 2.  Is it possible for Condor to give Sally's jobs a higher priority
> *just for this submittal*?  We don't want Sally's jobs to always have
> higher priority just because she is Sally, only because she indicates
> they need higher priority somehow.
>   

This can be accomplished with the machine Rank expression.  For example:

Rank = -TARGET.JobPrio

However, be warned that allocation of resources by machine rank is an 
iterative process.  First the negotiator hands out resources based on 
user priorities.  If a machine prefers to run some other job than the 
one that it got in the first round, this first job will need to be 
preempted (or suspended) in order for the machine to start running the 
preferred job.

> 3.  Is it possible for Condor to suspend a job and run another job on a
> single machine?
>   

Yes.  It's not trivial, but it is possible.  What you can do is create 
an extra execution slot that suspends its job when the other slot is 
active.  Here's an example in the manual of how to set it up.


http://www.cs.wisc.edu/condor/manual/v6.8/3_5Startd_Policy.html#SECTION004510600000000000000

--Dan