LSF Version 7.3 - Using Platform LSF HPC

By default, the per-processor job slot limit is 1 (PJOB_LIMIT=1 in the rms queue in
lsb.queues).
Do not change this default.
If LSF operates on a large system (for example, a system with more than 32 hosts), you
may need to configure the parameter MAX_SBD_CONNS in
lsb.params.
MAX_SBD_CONNS controls the maximum number of files
mbatchd can have open
and connected to
sbatchd.
In a very busy cluster with many jobs being dispatched, running, finishing at the same
time, you may see it takes a very long time for
mbatchd to update the status change of
a job, and to dispatch new jobs. If your cluster shows this behavior, you should set
MAX_SBD_CONNS = (number_of_hosts) * 2 or 300, which ever is less. Setting
MAX_SBD_CONNS too high may slow down the speed of
mbatchd dispatching new
jobs.
◆ About job limits and configuring hosts and queues, see Administering
Platform LSF
◆ About the bqueues command and the lsb.hosts, lsb.params, and
lsb.queues files, see the Platform LSF Configuration Guide
Configuring default and mandatory topology scheduling options
Use the DEFAULT_EXTSCHED and MANDATORY_EXTSCHED queue
paramters in
lsb.queues to configure default and mandatory topology scheduling
options.
DEFAULT_EXTSCHED=RMS[ allocation_type ;topology ;flags ]
Specifies default topology scheduling options for the queue.
-extsched options on the bsub command are merged with
DEFAULT_EXTSCHED options, and
-extsched options override any conflicting
queue-level options set by DEFAULT_EXTSCHED.
For example, if
DEFAULT_EXTSCHED=RMS[RMS_SNODE;rails=2] and a job is
submitted with
-extsched "RMS[base=hostA;rails=1;ptile=2]", LSF uses
the following resulting options for scheduling:
RMS_SNODE;rails=1;base=hostA;ptile=2
DEFAULT_EXTSCHED can be used in combination with
MANDATORY_EXTSCHED in the same queue. For example:
◆ -extsched "RMS[base=hostA;ptile=2]"
◆ DEFAULT_EXTSCHED=RMS[rails=2]
◆ MANDATORY_EXTSCHED=RMS[RMS_SNODE;ptile=4]
LSF uses the resulting options for scheduling:
RMS_SNODE;rails=2;base=hostA;ptile=4