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Currently preempt_sort by default is set to 'min_time_since_start'. Basically between jobs selected for preemption it will choose to preempt jobs with least amount of running time first. When we unset preempt_sort from qmgr the attribute itself is removed and , the jobs selected for preemption will be sorted with longest running time first. It does not make make sense to select jobs that have longest running time for preemption.
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