Platform LSF Administration Guide Version 6.2

Limiting the Number of Processors Allocated
Administering Platform LSF
442
Limiting the Number of Processors Allocated
Use the PROCLIMIT parameter in lsb.queues to limit the number of processors
that can be allocated to a parallel job in the queue.
◆ “Syntax” on page 442
◆ “How PROCLIMIT affects submission of parallel jobs” on page 442
◆ “Changing PROCLIMIT” on page 443
◆ “MultiCluster” on page 443
◆ “Automatic queue selection” on page 443
◆ “Examples” on page 444
Syntax
PROCLIMIT = [minimum_limit [default_limit]] maximum_limit
All limits must be positive numbers greater than or equal to 1 that satisfy the following
relationship:
1 <= minimum <= default <= maximum
You can specify up to three limits in the PROCLIMIT parameter:
How PROCLIMIT affects submission of parallel jobs
The -n option of bsub specifies the number of processors to be used by a parallel job,
subject to the processor limits of the queue.
Jobs that specify fewer processors than the minimum PROCLIMIT or more processors
than the maximum PROCLIMIT cannot use this queue and are rejected.
If a default value for PROCLIMIT is specified in the queue, jobs submitted without
specifying
-n use the default number of processors. If the queue has only minimum and
maximum values for PROCLIMIT, the number of processors is equal to the minimum
value. If only a maximum value for PROCLIMIT is specified, or the queue has no
PROCLIMIT, the number of processors is equal to 1.
Incorrect processor limits are ignored, and a warning message is displayed when LSF is
reconfigured or restarted. A warning message is also logged to the
mbatchd log file
when LSF is started.
If you specify ... Then ...
One limit It is the maximum processor limit. The minimum and default limits are
set to 1.
Two limits The first is the minimum processor limit, and the second is the
maximum. The default is set equal to the minimum.
The minimum must be less than or equal to the maximum.
Three limits The first is the minimum processor limit, the second is the default
processor limit, and the third is the maximum.
The minimum must be less than the default and the maximum.