Just a question on expected behavior of the backfill scheduler. This is
an SMP machine if that matters. Scheduler is backfill with no preemption.
I have a number of jobs queued. There are three which matter, ordered
by priority. In the current state I have 60 free cores.
job 201 needs 200 cores and will start in 1 hour requiring 24 hours of
runtime
job 202 needs 250 cores and will start in 5 hours requiring 24 hours of
runtime
...
job 300 needs 30 cores and will start in 300 hours requiring 2 hours of
runtime
The job completing in 1 hour will free 252 cores.
Clearly, starting job 300 will not impact job 201's start time in any
way. Yet it will not start since the time overlaps the expected 1 hour
start time of job 201. Is this the expected behavior? I haven't yet
checked the source code to verify that this just looks at the trivial
impact on the next job but I'd expect the scheduler to be able to look a
little deeper than this.
Bill
