Deadline constraints suspend or terminate running jobs at a certain time. There are two kinds of deadline constraints:
A run window, specified at the queue level, suspends a running job
A termination time, specified at the job level (bsub -t), terminates a running job
A CPU limit, specified at job or queue level, terminates a running job when it has used up a certain amount of CPU time.
A run limit, specified at the job or queue level, terminates a running job after it has spent a certain amount of time in the RUN state.
If deadline constraint scheduling is enabled, LSF does not place a job that will be interrupted by a deadline constraint before its run limit expires, or before its CPU limit expires, if the job has no run limit. In this case, deadline constraint scheduling could prevent a job from ever starting. If a job has neither a run limit nor a CPU limit, deadline constraint scheduling has no effect.
A job that cannot start because of a deadline constraint causes an email to be sent to the job owner.
Deadline constraint scheduling only affects the placement of jobs. Once a job starts, if it is still running at the time of the deadline, it will be suspended or terminated because of the deadline constraint or resource usage limit.
LSF considers both job termination time and queue run windows as part of deadline constraints. Since the job has already started, LSF does not apply deadline constraint scheduling to job resize allocation requests.