LSF Version 7.3 - Administering Platform LSF

Administering Platform LSF 519
Running Parallel Jobs
Assumptions and limitations
◆ The interruptible backfill job holds the slot-reserving job start until its
calculated start time, in the same way as a regular backfill job. The interruptible
backfill job is killed when its run limit expires.
◆ Killing other running jobs prematurely does not affect the calculated run limit
of an interruptible backfill job. Slot-reserving jobs do not start sooner.
◆ While the queue is checked for the consistency of interruptible backfill, backfill
and runtime specifications, the requeue exit value clause is not verified, nor
executed automatically. Configure requeue exit values according to your site
policies.
◆ In LSF MultiCluster, bhist does not display interruptible backfill information
for remote clusters.
◆ A migrated job belonging to an interruptible backfill queue is migrated as if
LSB_MIG2PEND is set.
Configure an interruptible backfill queue
1 Configure INTERRRUPTIBLE_BACKFILL=seconds in the lowest priority
queue in the cluster. There can only be one interruptible backfill queue in the
cluster.
Specify the minimum number of seconds for the job to be considered for
backfilling.This minimal time slice depends on the specific job properties; it
must be longer than at least one useful iteration of the job. Multiple queues may
be created if a site has jobs of distinctively different classes.
For example:
Begin Queue
QUEUE_NAME = background
# REQUEUE_EXIT_VALUES (set to whatever needed)
DESCRIPTION = Interruptible Backfill queue
BACKFILL = Y
INTERRUPTIBLE_BACKFILL = 1
RUNLIMIT = 10
PRIORITY = 1
End Queue
Interruptible backfill is disabled if BACKFILL and RUNLIMIT are not
configured in the queue.
The value of INTERRUPTIBLE_BACKFILL is the minimal time slice in
seconds for a job to be considered for backfill. The value depends on the
specific job properties; it must be longer than at least one useful iteration of the
job. Multiple queues may be created for different classes of jobs.
BACKFILL and RUNLIMIT must be configured in the queue.
RUNLIMIT corresponds to a maximum time slice for backfill, and should be
configured so that the wait period for the new jobs submitted to the queue is
acceptable to users. 10 minutes of runtime is a common value.