HP XC System 4.x Software Arguments for the Slurm External Scheduler, Nodelist=list of nodes

options that specify the minimum number of nodes required for the job, specific nodes for the job, and so on.

Note:

The SLURM external scheduler is a plug-in developed by Platform Computing for LSF; it is not actually part of SLURM. This plug-in communicates with SLURM to gather resource information and request allocations of nodes, but it is integrated with the LSF scheduler.

The format of this option is shown here:

-ext"SLURM[slurm-arguments]"

The bsub command format to submit a parallel job to an LSF allocation of compute nodes using the external scheduler option is as follows:

bsub -nnum-procs -ext"SLURM[slurm-arguments]"[bsub-options][ -srun[srun-options]

] [jobname] [job-options]

The slurm-argumentsparameter can be one or more of the following srun options, separated by semicolons, as described in Table 5-1.

Table 5-1 Arguments for the SLURM External Scheduler

SLURM Arguments	Function
nodes=min[-max]	Specifies the minimum and maximum number of nodes allocated to job.
	The job allocation will contain at least the minimum number of nodes.
mincpus=ncpus	Specifies minimum number of cores per node. Default value is 1.
mem=value	Specifies a minimum amount of real memory in megabytes of each node.
tmp=value	Specifies a minimum amount of temporary disk space in megabytes of each
	node.
constraint=feature	Specifies a list of constraints. The list may include multiple features
	separated by “&” or “”. “&” represents ANDed, “” represents ORed.
nodelist=list of nodes	Requests a specific list of nodes. The job will at least contain these nodes.
	The list may be specified as a comma-separated list of nodes or a range of
	nodes
exclude=list of nodes	Requests that a specific list of hosts not be included in resource allocated
	to this job. The list may be specified as a comma-separated list of nodes or
	a range of nodes.
contiguous=yes	Requests a mandatory contiguous range of nodes.

The Platform LSF documentation provides more information on general external scheduler support.

Consider an HP XC system configuration in which lsfhost.localdomain is the LSF execution host and nodes n[1-10]are compute nodes in the lsf partition. All nodes contain two cores, providing 20 cores for use by LSF jobs.

Example 5-9shows one way to submit a parallel job to run on a specific node or nodes.

54 Submitting Jobs