Administering Platform LSF - SAS

Chapter 18
Managing Software Licenses with LSF
The queue named q_verilog contains jobs that will reserve one Verilog
license when it is started.
If the Verilog licenses are not cluster-wide, but can only be used by some
hosts in the cluster, the resource requirement string should include the
defined() tag in the select section:
select[defined(verilog)] rusage[verilog=1]
Preventing underutilization of licenses
One limitation to using a dedicated queue for licensed jobs is that if a job does
not actually use the license, then the licenses will be under-utilized. This could
happen if the user mistakenly specifies that their application needs a license,
or submits a non-licensed job to a dedicated queue.
LSF assumes that each job indicating that it requires a Verilog license will
actually use it, and simply subtracts the total number of jobs requesting
Verilog licenses from the total number available to decide whether an
additional job can be dispatched.
Use the duration keyword in the queue resource requirement specification
to release the shared resource after the specified number of minutes expires.
This prevents multiple jobs started in a short interval from over-using the
available licenses. By limiting the duration of the reservation and using the
actual license usage as reported by the ELIM, underutilization is also avoided
and licenses used outside of LSF can be accounted for.
When interactive jobs compete for licenses
Example
In situations where an interactive job outside the control of LSF competes with
batch jobs for a software license, it is possible that a batch job, having reserved
the software license, may fail to start as its license is intercepted by an
interactive job. To handle this situation, configure job requeue by using the
REQUEUE_EXIT_VALUES parameter in a queue definition in lsb.queues. If a
job exits with one of the values in the REQUEUE_EXIT_VALUES, LSF will
requeue the job.
Jobs submitted to the following queue will use Verilog licenses:
Begin Queue
QUEUE_NAME = q_verilog
RES_REQ=rusage[verilog=1:duration=1]
# application exits with value 99 if it fails to get license
REQUEUE_EXIT_VALUES = 99
JOB_STARTER = lic_starter
End Queue
All jobs in the queue are started by the job starter lic_starter, which checks
if the application failed to get a license and exits with an exit code of 99. This
causes the job to be requeued and LSF will attempt to reschedule it at a later
time.
Administering Platform LSF 283