Backfilling Variants 1.Depending on the order in which the queue is scanned to find backfilling jobs 1.By estimated runtime or estimated slowdown 1.Slowdown – (wait_time + running time)/running_time 2.Dynamic backfilling/slack-based backfilling – overruling previous reservation if introducing a slight delay will improve utilization considerably\ 1.Each job in the queue is associated with a slack – maximum delay after reservation.
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