HP XC System 3.x Software - Manual (Page 28)

2.2.1 Introduction
As described in “Run-Time Environment” (page 24) , SLURM and LSF-HPC cooperate to run and manage
jobs on the HP XC system, combining LSF-HPC's powerful and flexible scheduling functionality with
SLURM's scalable parallel job-launching capabilities.
SLURM is the low-level resource manager and job launcher, and performs core allocation for jobs. LSF-HPC
gathers information about the cluster from SLURM. When a job is ready to be launched, LSF-HPC creates
a SLURM node allocation and dispatches the job to that allocation.
Although you can launch jobs directly using SLURM, HP recommends that you use LSF-HPC to take
advantage of its scheduling and job management capabilities. You can add SLURM options to the LSF-HPC
job launch command line to further define job launch requirements. Use the HP-MPI mpirun command
and its options within LSF-HPC to launch jobs that require MPI's high-performance message-passing
capabilities.
When the HP XC system is installed, a SLURM partition of nodes is created to contain LSF-HPC jobs. This
partition is called the lsf partition.
When a job is submitted to LSF-HPC, the LSF-HPC scheduler prioritizes the job and waits until the required
resources (compute nodes from the lsf partition) are available.
When the requested resources are available for the job, LSF-HPC creates a SLURM allocation of nodes on
behalf of the user, sets the SLURM JobID for the allocation, and dispatches the job with the LSF-HPC
JOB_STARTER
script to the first allocated node.
A detailed explanation of how SLURM and LSF-HPC interact to launch and manage jobs is provided in
“How LSF-HPC and SLURM Launch and Manage a Job” (page 88) .
2.2.2 Getting Information About Queues
The LSF bqueues command lists the configured job queues in LSF-HPC. By default, bqueues returns
the following information about all queues:
• Queue name
• Queue priority
• Queue status
• Job slot statistics
• Job state statistics
To get information about queues, enter the bqueues as follows:
$ bqueues
For more information about using this command and a sample of its output, see “Examining System
Queues” (page 92)
2.2.3 Getting Information About Resources
The LSF bhosts, lshosts, and lsload commands are quick ways to get information about system
resources. LSF-HPC daemons run on only one node in the HP XC system, so the bhosts and lshosts
commands 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.
• The LSF bhosts command provides a summary of the jobs on the system and information about the
current state of LSF-HPC.
$ bhosts
For more information about using this command and a sample of its output, see “Examining System
Core Status” (page 90)
• The LSF lshosts command displays machine-specific information for the LSF execution host node.
$ lshosts
28 Using the System