HP XC System Software Administration Guide Version 3.2

Table 16-3 Environment Variables for LSF-HPC with SLURM Enhancement (lsf.conf File) (continued)
DescriptionEnvironment Variable
This setting enables external scheduling for LSF-HPC with SLURM
The default value is Y, which is automatically set by lsfinstall.
LSF_ENABLE_EXTSCHEDULER=Y|y
This setting enables Platform LSF extensions.
This setting is undefined by default.
The following extension names are supported:
• SHORT_EVENTFILE
This compresses long host name lists when event records are
written to the lsb.events and lsb.acct files for large parallel
jobs. The short host string has the format:
number_of_hosts*real_host_name
When SHORT_EVENTFILE is enabled, older daemons and
commands (prior to LSF Version 6.2) cannot recognize the
lsb.acct and lsb.events file format. For example, the original
host list record is as follows:
6 "hostA" "hostA" "hostA" "hostA" "hostB" "hostC"
Redundant host names are removed and the host count is changed
so that the short host list record is as follows:
3 "4*hostA" "hostB" "hostC"
When LSF_HPC_EXTENSION="SHORT_EVENTFILE" is set, and
LSF reads the host list from the lsb.events or lsb.acct files,
the compressed host list is expanded into a normal host list. This
setting applies to the following events:
— JOB_START — when a normal job is dispatched.
— JOB_FORCE — when a job is forced with the brun command.
— JOB_CHUNK — when a job is inserted into a job chunk.
— JOB_FORWARD — when a job is forwarded to a MultiCluster
leased host.
— JOB_FINISH in lsb.acct.
• SHORT_PIDLIST
This shortens the output from the bjobs command to eliminate
many of the process IDs (PIDs) for a job. The bjobs command
displays only the first ID and a count of the process group IDs
(PGIDs) and process IDs for the job. Without the SHORT_PIDLIST
setting, the bjobs -l command displays all the PGIDs and PIDs
for the job. With SHORT_PIDLIST set, the bjobs -l command
displays a count of the PGIDs and PIDs.
• RESERVE_BY_STARTTIME
LSF-HPC with SLURM selects the reservation that gives the job
the earliest predicted start time. By default, if multiple host groups
are available for reservation, LSF-HPC with SLURM chooses the
largest possible reservation based on the number of slots. When
backfill is configured, this can lead to larger jobs not running as
their start times are pushed further into the future.
• BRUN_WITH_TOPOLOGY
If a topology request can be satisfied for a brun job, brun preserves
the topology request. LSF-HPC with SLURM allocates the resource
according to the request and tries to run the job with the requested
topology. If allocation fails because the topology request cannot
be satisfied, the job is queued again. By default, the job topology
request is ignored by the scheduler when it creates an allocation
if BRUN_WITH_TOPOLOGY is not specified.
LSF_HPC_EXTENSIONS="ext_name,..."
208 Managing LSF