For the best use of system resources when launching
an application, it is useful to know the system resources that are
available for your use. This section describes how to obtain information
about system resources such as the number of cores available, LSF
execution host node information, and LSF-HPC system queues.
Examining System Core Status |
 |
The bhosts command displays LSF-HPC resource
usage information. This command is useful to examine the status of
the system cores. The bhosts command provides
a summary of the jobs on the system and information about the current
state of LSF-HPC. For example, it can be used to determine if LSF-HPC is
ready to start accepting batch jobs.
LSF-HPC daemons run on only one node in the HP XC system,
so the bhosts command will list one host, which
represents all the resources of the HP XC system. The total
number of cores for that host should be equal to the total number
of cores assigned to the SLURM lsf partition.
By default, this command returns the host name,
host status, and job state statistics.
The following example shows the output from the bhosts command:
$ bhosts
HOST_NAME STATUS JL/U MAX NJOBS RUN SSUSP USUSP RSV
lsfhost.localdomain ok - 16 0 0 0 0 0 |
Of note in the bhosts output:
The HOST_NAME column displays the name of the LSF execution host.
The MAX column displays the total core count (usable cores) of all available
computer nodes in the lsf partition.
The STATUS column shows the state of LSF-HPC and displays a status of
either ok or closed.
The NJOBS column displays the number of jobs. Note that in LSF terminology,
a parallel job with 10 tasks counts as 10 jobs.
Getting Information About the LSF Execution Host Node |
|
The lshosts command displays
resource information about the LSF-HPC cluster. This command
is useful for verifying machine-specific information.
LSF-HPC daemons run on only one node in the HP XC system,
so the lshosts command will list one host —
which represents all the resources assigned to it by the HP XC system.
The total number of cores for that host should be equal to the total
number of cores assigned to the SLURM lsf partition.
By default, lshosts returns
the following information: host name, host type, host model, core factor,
number of cores, total memory, total swap space, server information,
and static resources.
The following example shows the output from the lshosts command:
$ lshosts
HOST_NAME type model cpuf ncpus maxmem maxswp server RESOURCES
lsfhost.loc SLINUX6 Itanium2 16.0 12 3456M - Yes (slurm)
n7 UNKNOWN UNKNOWN_ 1.0 - - - No ()
n8 UNKNOWN UNKNOWN_ 1.0 - - - No ()
n2 UNKNOWN UNKNOWN_ 1.0 - - - No () |
Of note in the lshosts output:
The HOST_NAME column displays the
name of the LSF execution host, lsfhost.localdomain and any other HP XC nodes that have been granted a floating
client license because LSF commands were executed on them. LSF-HPC does
not know about these floating client hosts, so they are listed as UNKNOWN types and models.
The type column displays the type
of resource. This value is SLINUX64 for all HP XC systems.
The ncpus column displays the total core count
(usable cores) of all available computer nodes in the lsf partition.
The maxmem column displays minimum maxmem over all available computer nodes in the lsf partition.
The maxtmp column (not shown) displays
minimum maxtmp over all available computer nodes
in the lsf partition. Use the lshosts
-l command to display this column.
Getting Host Load Information |
|
The LSF lsload command displays
load information for LSF execution hosts.
$ lsload
HOST_NAME status r15s r1m r15m ut pg ls it tmp swp mem
lsfhost.loc ok - - - - - 4 - - - -
|
In the previous example output, the LSF execution
host (lsfhost.localdomain) is listed under the HOST_NAME column. The status is listed
as ok, indicating that it can accept remote jobs.
The ls column shows the number of current login
users on this host.
See the OUTPUT section of the lsload manpage for further information about the output
of this example. In addition, see the Platform Computing Corporation
LSF documentation and the lsload(1) manpage for more information
about the features of this command.
For individual compute node load information, see
the discussion on metrics in shownode(1).
Examining System Queues |
|
All jobs on the HP XC system that are submitted
to LSF-HPC are placed into an LSF-HPC job queue.HP recommends
that you examine the status and availability of LSF-HPC system
queues before launching a job so that you can select the most appropriate
queue for your job.
You can easily verify the status, limits, and configurations
of LSF-HPC queues with the bqueues command.
This command is fully described in Platform Computing Corporation's
LSF documentation and manpages.
See bsub(1) for more information on submitting
jobs to specific queues.
For more information on the bqueues command, see bqueues(1).
Getting Information About the lsf Partition |
|
Information about the SLURM lsf compute node partition can be viewed with the SLURM sinfo command. A partition is one or more compute nodes that have been
grouped together. A SLURM lsf partition is created
when the HP XC system is installed. This partition contains
the resources that will be managed by LSF-HPC and available for
jobs submitted to LSF-HPC.
The sinfo command reports the
state of the lsf partition and all other partitions
on the system. The sinfo command displays a summary
of available partition and node information such as partition names,
nodes/partition, and cores/node). It has a wide variety of filtering,
sorting, and formatting options.
The following example shows the use of the sinfo command to obtain lsf partition
information:
$ sinfo -p lsf
PARTITION AVAIL TIMELIMIT NODES STATE NODELIST
lsf up infinite 128 idle n[1-128] |
Use the following command to obtain more information
on the nodes in the lsf partition:
$ sinfo -p lsf -lNe
NODELIST NODES PARTITION STATE CPUS MEMORY TMP_DISK WEIGHT FEATURES REASON
n[1-128] 128 lsf idle 2 3456 1 1 (null) none |
See “Getting System Information with the sinfo Command” and the sinfo(1) manpage and for further information about using the sinfo command.
Printable version
