Platform LSF Administration Guide Version 6.2

Chapter 16
Fairshare Scheduling
Administering Platform LSF
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Begin Queue
QUEUE_NAME = queue3
PRIORITY = 50
NICE = 10
PREEMPTION = PREEMPTIVE
QJOB_LIMIT = 10
UJOB_LIMIT = 1
PJOB_LIMIT = 1
End Queue
Controlling job dispatch order in cross-queue fairshare
DISPATCH_ORDER
parameter
(lsb.queues)
Use DISPATCH_ORDER=QUEUE in the master queue to define an ordered cross-
queue fairshare set. DISPATCH_ORDER indicates that jobs are dispatched according
to the order of queue priorities, not user fairshare priority.
Priority range in
cross-queue
fairshare
By default, the range of priority defined for queues in cross-queue fairshare cannot be
used with any other queues. The priority of queues that are not part of the cross-queue
fairshare cannot fall between the priority range of cross-queue fairshare queues.
For example, you have 4 queues:
queue1, queue2, queue3, and queue4. You
configure cross-queue fairshare for
queue1, queue2, and queue3, and assign
priorities of 30, 40, 50 respectively. The priority of
queue4 (which is not part of the
cross-queue fairshare) cannot fall between 30 and 50, but it can be any number up to 29
or higher than 50. It does not matter if
queue4 is a fairshare queue or FCFS queue.
If DISPATCH_ORDER=QUEUE is set in the master queue, queues that are not part
of the ordered cross-queue fairshare can have any priority. Their priority can fall within
the priority range of cross-queue fairshare queues and they can be inserted between two
queues using the same fairshare tree. In the example above,
queue4 can have any
priority, including a priority falling between the priority range of the cross-queue
fairshare queues (30-50).
Jobs from equal
priority queues
◆ If two or more non-fairshare queues have the same priority, their jobs are
dispatched first-come, first-served based on submission time or job ID as if they
come from the same queue.
◆ If two or more fairshare queues have the same priority, jobs are dispatched in the
order the queues are listed in
lsb.queues.